单项选择题

When I arrived, I learned my classmates ______ for almost an hour.

A. had gone
B. had started
C. had left
D. had been away
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单项选择题
He has never been late for school. He is always the first one ______.
A. arriving
B. arrives
C. to arrive
D. arrive
单项选择题
Your sister studies hard now, you ______ worry about her.
A. can' t
B. needn' t
C. may not
D. mustn' t
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