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— Mary, whose photo is it?
—It ______ be Lu’s. Those are her parents.
A.canB.shouldC.mustD.need
C

试题分析:A. can能够B. should应该C. must必须 D. need需要;句意:玛丽,这是谁的照片?它肯定是露的,这是她的父母亲。故选C.
点评:情态动词用法较多,无人称和数的变化, 情态动词后面跟的动词需用原形,否定式构成是在情态动词后面加 "not"。 must必须肯定的推测,can’t表否定的推测。个别情态动词有现在式和过去式两种形式, 过去式用来表达更加客气, 委婉的语气, 时态性不强, 可用于过去,现在或将来。中学阶段必须对它们的用法有个基本的了解,题目不难,掌握了平时出现的题目即可答出。
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