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题目
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If you have something important to do, you ___ waste any time.
A.needn’tB.mustn’tC.may notD.won’t

答案
B
解析
根据句意应用mustn’t表示:不准。
核心考点
试题【If you have something important to do, you ___ waste any time.A.needn’tB.mustn’t】;主要考察你对虚拟语气等知识点的理解。[详细]
举一反三
You ___ me, but since you have,I’ll keep it secret from others.
A.needn’t have toldB.didn"t need to tellC.wouldn"t have toldD.couldn"t have told

题型:不详难度:| 查看答案
If you want to borrow a football after school, your student card ___ here.
A.has to leaveB.must leaveC.has to be leftD.must be left

题型:不详难度:| 查看答案
As a graducate in computer science, he ___ to work out the problem.
A.wouldn"t have failedB.can"t have failedC.mustn’t have failedD.might not have failed

题型:不详难度:| 查看答案
You did not go to the party yesterday, or I ___ you.
A.would seeB.could meetC.might have seenD.might see

题型:不详难度:| 查看答案
—Did you arrive here this morning?
—Yes,it was at nine o’clock ____we came here.
A.whenB.before
C.whichD.that

题型:不详难度:| 查看答案
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