(2013·成都第二次诊断)-Where did you get this book?-I picked it up from a second?hand bookshop if you know.A．must B．willC．can D．shall 题目和参考答案——青夏教育精英家教网—

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(2013·成都第二次诊断)—Where did you get this book?

—I picked it up from a second?hand bookshop if you ________ know.

A．must B．will

C．can D．shall

【解析】选A　考查情态动词。if you must (do sth.)表示“如果你一定要(那么做)”，所以选A，表示“如果你一定要知道的话”。

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