单项选择题
单项选择题 John is a heavy smoker.His room is always ()smoke.
A.covered with
B.full of
C.filled in
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单项选择题
The homeless boy slept on the ground () his dirty shirt as a cover.
A.with
B.by
C.on
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单项选择题
You () buy this book.I have already bought one for you.
A.mustn‘t
B.needn’t
C.won’t
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