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题目
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— Must they clean and tidy the classroom now?
— No, they      . It       after school in the afternoon.
A.mustn’t; must cleanB.needn’t; must clean
C.mustn’t; need be cleanedD.don’t have to; can be cleaned

答案
D
解析
must构成的一般疑问句通常否定回答时用needn’t或don’t have to,本题的最后一句是被动句,结构为be+过去分词,即be cleaned,故本题选D。
核心考点
试题【— Must they clean and tidy the classroom now? — No, they      . It       after s】;主要考察你对词法等知识点的理解。[详细]
举一反三
Jack _______ swim when he was five years old.
A.canB.could C.mayD.must

题型:不详难度:| 查看答案
They can hardly move at all, _____________?
A.can theyB.can’t theyC.don’t theyD.are they

题型:不详难度:| 查看答案
---Look. The man at the gate _____ be our headmaster. He is always standing there every morning.
---No. it ____ be him. He is having a meeting in the office now.
A.must; can’tB.must; mustn’t
C.can’t; can’tD.can’t; mustn’t

题型:不详难度:| 查看答案
—Is the woman over there Miss White?
—It ______ be her. She’s gone to Hangzhou.
A.mustB.can’tC.needn’tD.may

题型:不详难度:| 查看答案
—May I         this pair of blue jeans? —Yes, you        .
A.try on; shouldB.try on; can
C.have a look; canD.look at; must

题型:不详难度:| 查看答案
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