—Where did you get this book?
—I picked it up from a second-hand bookshop if you ______ know.
A．mustB．willC．canD．shall
A

試題分析：A. must必須，一定             B. will將要    C. can能夠  D. shall將要；句意：你從哪里得到這本書的？如果你一定要知道的話，我是從二手書店買的。故選A
點(diǎn)評：情態(tài)動詞是高考的必考語言點(diǎn)。情態(tài)動詞表必要性時用must(必須)與don’t have to / needn’t(不必要)；表推測時用must (肯定、一定)與 can’t/couldn’t (不可能)；表請求和許可時can/may(可以、能夠)與can’t/mustn’t(禁止、不許)。shall多用于法律條文中，表示必須。
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