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题目
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______ it have been the failure to pick up directions from the ground control that caused the air crash?
A.MustB.CouldC.Would D.Should

答案
B
解析

核心考点
试题【 ______ it have been the failure to pick up directions from the ground control 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 just think of yourself! You kept me wailing for at least three hours.
—I" m sorry that you _____________ think so.
A.wouldB.shouldC.couldD.might

题型:不详难度:| 查看答案
– Is your brother going to Jack’s birthday party tonight?
– I am not sure. He _____ go to the concert with his girlfriend instead.
A.ought toB.has toC.mightD.must

题型:不详难度:| 查看答案

Living in such a high mountain  _________be cold.
A.shouldB.canC.mayD.must

题型:不详难度:| 查看答案
— Must I take a taxi?
—No, you______. It is only a six minutes’ walk. 
A. don’t have to             B. must                  C  can’t           D ought to
题型:不详难度:| 查看答案
--It’s said that no one ______ light a cigarette at a gas station.
--- Yes. Safety always comes the first.
A.canB.mayC.shallD.must

题型:不详难度:| 查看答案
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