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题目
题型:不详难度:来源:
I saw him leave the office an hour ago . He ____ at this time .
A.mustn""t be working B.can""t be working
C.can""t work D.may not being working

答案
B。
解析
must 表示猜测时只用于肯定句。may 可用于肯定句或否定句,但D项有明显错误。can 用于否定句中则表示“不可能”,本句的意义表示正在进行的动作,选C不合适。
核心考点
试题【I saw him leave the office an hour ago . He ____ at this time . A.mustn""t be wo】;主要考察你对虚拟语气等知识点的理解。[详细]
举一反三
Why ____ you keep on troubling me with such questions while I""m busy ?
A.couldB.canC.mustD.will

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Help me with this suitcase , ____ you ?
A.don""tB.willC.doD.shall

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— ____ I go out to play now , Mum ?
— No , you ____ .
A.May ; shouldn""tB.Can ; needn""tC.Must ; can""tD.May ; mustn""t

题型:不详难度:| 查看答案
We started early that morning in order that we ____ there before noon .
A.might getB.may getC.would getD.got

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You are running a fever . You ____ to see the doctor .
A.need goB.must have goneC.should goD.can go

题型:不详难度:| 查看答案
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