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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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

单项选择题

Though eight years have passed, I still remember（）to Mr. Ma during my visit there.

A．introducing
B．being introduced
C．to be introduced
D．introduced

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