From industrial beginnings in the nineteenth century, plastics______through a hundred and twenty years of glory, failure, disrepute and suspicion on the slow road to public acceptance.
A．struggled
B．have struggled
C．are struggling
D．has struggled

未分类题The king made a promise______he would give the tailor both half of his kingdom and his daughter, but none the tailor had.A．whenB．onceC．thatD．since

未分类题So far environmental protection has left much room ______ ; lumbering and hunting have done immense damage to the environment.A．to be desiredB．to desireC．desiredD．for desiring

未分类题They are trying to find out whether there is something about the way we teach language to children______in fact prevents children from learning sooner.A．in whichB．whichC．whatD．how

未分类题The project, ______ by the end of 2010, will expand the citys telephone network to cover 1 000 000 users.A．accomplishedB．being accomplishedC．to be accomplishedD．having been accomplished

未分类题This did lead to the concentration of industrial development ______ the local fields, a phenomenon well seen in such countries as Britain.A．fromB．toC．onD．of

未分类题He______a drink for the sake of the drink, but only to know the kind of life in the east !A．needn't have hadB．would have hadC．did haveD．would not have had

未分类题______little rain in the past sixty days, the ground is dry and people feel uncomfortable.A．There has beenB．There isC．There beingD．There having been

未分类题It is time we stared to think seriously about the growing shortage of raw materials in the world today and ______ this mad destruction of our environment by our throw-away society.A．stopB．stoppedC．to stopD．would stop

未分类题Galileo found it difficult to believe that the sun rotated around the earth and the earth______the center of the universe.A．to beB．isC．wasD．would be

未分类题______all visible lights, red light has the longest and violet the shortest wavelength.A．AmongB．OfC．ForD．To

未分类题I find the courage of treatment by the author______so delights us, and which large perception only can inspire.A．whoB．asC．whatD．which

未分类题It is illegal to use this equipment for______firing purpose. Unauthorized use is malicious destruction of property and is punishable by a $ 50 000 fine.A．other thanB．none butC．otherwiseD．rather than

未分类题Hurry up, or the tickets______out by the time we get there.A．will have been soldB．will sellC．have soldD．have been sold

未分类题Whenever we hear of a natural disaster, even in the distant part of the world, we feel sympathy for the people______.A．to have affectedB．being affectedC．to have been affectedD．affected

未分类题A very few courses are restricted to people already working in a profession or in other way; ______ this is the case, it is mentioned in the university handbook.A．forB．whereC．sinceD．because