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—Where did you get this book?
—I picked it up from a second­hand bookshop if you ________ know.
A.mustB.will
C.canD.shall
A
答案:A 考查情态动词辨析。句意为:你在哪买到这本书的?如果你非要知道的话,我是在二手书店买到的。must此处表示“非要,偏偏”,符合题意,故选A。
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