—Where did you get this book? —I picked ...

—Where did you get this book?

—I picked it up from a secondhand bookshop if you ________ know.

A．must B．will

C．can D．shall

A 【解析】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。

考点分析：

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