题目内容

-May I take this book out? -No, you___.

A. can't
B. may not
C. needn't
D. aren't

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-He_ be in the classroom, I think. -No, he _ be in the classroom. I saw him go home a minute ago.

A. can; may not
B. must; may not
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A. may not
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Even the top students in our class can't work out this problem, so it ___bevery difficult.

A. may
B. must
C. can
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A. can't
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C. mustn't
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