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
It really ______ to witness such an enormity can occur in the so-called civilized society.
A．pains her
B．makes her pain
C．is paining
D．is pained
单项选择题
If the whole framework of the thesis ______ beforehand, a great deal of time and energy would have beeh saved.
A．was designed
B．had been designed
C．were designed
D．has been designed
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