单项选择题

The President of Harvard pioneered the elective system by（）students were able to choose their own courses of study.

A．what
B．whom
C．that
D．which

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单项选择题
His mother asks him to do morning exercises, but he is not used to（）early in the morning.

A．get up
B．getting up
C．be gotten up
D．being gotten up
单项选择题
Michael failed the exam. He（）have spent so much time playing computer games and chatting online.

A．mustn't
B．couldn't
C．wouldn't
D．shouldn't
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