中文谷—Whereonearthdidyougetthebook?—It’sfromMary,ifyou
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问题详情：
—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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