单项选择题

I can think of many cases () students obviously knew a lot of English words and expressions but couldn't write a good composition.

A.why
B.which
C.as
D.where

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单项选择题

— Don't go there alone in such late hours. — Don't worry. I ().

A.don't
B.won't
C.didn't
D.haven't

单项选择题

() the train station, he waved again and again to me.

A.Leaved
B.To leave
C.Lea
D.When leaving

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