单项选择题

Mike looks so sleepy in the class; he ______ up last night.

[A] must stay
[B] should have stayed
[C] must have stayed
[D] is sure to stay

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单项选择题

Generally speaking, ______ immigrants cannot totally cut the tie with their motherland and be assimilated by the foreign culture.

[A] most
[B] the most
[C] most of
[D] the most of

单项选择题

If the whole framework of the thesis ______ beforehand, a great deal of time and energy would have been saved.

[A] was designed
[B] had been designed
[C] were designed
[D] has been designed

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