单项选择题

Study hard, ______you won’t pass the coming English exam.

[A] and
B. or
C. but
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单项选择题
He drives much ______ than he did three years ago.
[A]more carefully
B.carefully
C.more careful
单项选择题
Don’t leave until he ______ back.
A. have come
B. comes

C. will come
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