—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

A

解析試題分析：句意：上文，你從哪里得到了這本書(shū)？下文，如果你必須知道，那么我告訴你，是從一個(gè)二手書(shū)店得到的。must   必須；will將會(huì)；can能；shall將要，選A。
考點(diǎn)：考查情態(tài)動(dòng)詞

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