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 —Whereonearthdidyougetthebook?—It’sfromMary,ifyou

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问题详情:

 —Whereonearthdidyougetthebook?—It’sfromMary,ifyou

 —Where on earth did you get the book?

—It’s from Mary, if you ________ know.

A. should                   B. could                    C. must                    D. may

【回答】

C

知识点:虚拟语气与情态动词

题型:选择题

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