题目内容

You must work _____ more carefully.

A. much
B. many
C. not lot

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There is _____ snow this year.

A. many
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C. a lot of
D. lot

My brother was very ill, so I _______ call the doctor in the middle of the night.

A. have to
B. had to
C. can
D. didn't have to

--May I stop my car here?--No, you _____ .

A. can't
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You _____ return the book now.You can keep it next week.

A. can't
B. mustn't
C. don't have to
D. may not