单项选择题

Michael failed the exam. He（）have spent so much time playing computer games and chat ring online.

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

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单项选择题
She is（）far the most active member in our group.

A. so
B. as
C. by
D. in
填空题
Who use steamboats today（）
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