---I’m afraid I return the book to you before Friday. --- Take your time.A. mustB. mayC.

问题补充：

---I’m afraid I return the book to you before Friday.

--- Take your time.

A. must

B. may

C. needn’t

D. can’t

答案：

A. must

B. may

C. needn’t

(答案→)D. can’t

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