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

试题分析:A. must必须,一定             B. will将要    C. can能够  D. shall将要;句意:你从哪里得到这本书的?如果你一定要知道的话,我是从二手书店买的。故选A
点评:情态动词是高考的必考语言点。情态动词表必要性时用must(必须)与don’t have to / needn’t(不必要);表推测时用must (肯定、一定)与 can’t/couldn’t (不可能);表请求和许可时can/may(可以、能够)与can’t/mustn’t(禁止、不许)。shall多用于法律条文中,表示必须。
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