A．maynt B．cant C．mustnt D．needntAs you worked late ……

单项选择题.Mr. Smith, I should tell you this is the fifth time you me for my twin sister.

单项选择题Scientists are convincedthe positive effect of laughterphysical and mental health.

单项选择题Now in China many young peopleimportant positions in the government.

单项选择题Information obtained from libraries is sooner forgotten than .

单项选择题Personally, I prefer to stay upat night, but notIll have to drive to work the next day.

单项选择题Tom as well as two of his friendsinvited to the party.

单项选择题Some people fear thatair pollution may bring about changes inweather around the world.