A. should ask B. should have askedC. must ask D. must h……

单项选择题All of them try to use the power of the workstation ______ information in a more effective way.

单项选择题We（）on this project for four hours. Let's have a rest.

A. are working
B. have been working
C. worked
D. had worked

单项选择题Galileo lived in the City of Pisa, ______ there is a leaning tower about 180 feet ______.

单项选择题She didn't see me come and went on ______ her newspaper.

单项选择题The air of countryside is cleaner than ______ of city, but I don't like to live ______ far.

单项选择题Madame Curie's ______ encouraged many women to study science, and many of them ______.

单项选择题Who is it up ______ decide ______ whether to go or not

单项选择题Some old pots ______ clay were found lying ______ to the dead body.

单项选择题The largest city in Canada is ______.

单项选择题The phenomenon that words having different meanings have the same form is called ______.