．－May I keep this book for two days?－No you. It’s a library book for reference only.A. ma

问题补充：

．－May I keep this book for two days?

－No, you. It’s a library book for reference only.

A. may not

B. mustn’t

C. needn’t

D. shouldn’t

答案：

A. may not

(答案→)B. mustn’t

C. needn’t

D. shouldn’t

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