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题目
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(2011·江西)It ________ be the postman at the door.It"s only six o"clock.
A.mustn"tB.can"tC.won"tD.needn"t

答案
B
解析
 根据It"s only six o"clock推知,那不可能是邮递员,否定形式推测要用can"t或couldn"t。因为must表推测时,只能用于肯定句。
核心考点
试题【(2011·江西)It ________ be the postman at the door.It"s only six o"clock.A.mustn"tB】;主要考察你对虚拟语气等知识点的理解。[详细]
举一反三
—Happy birthday!
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A.should have wishedB.must have wished
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A.could expressB.would express
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A.should faceB.might face
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—How unbelievable to get it back!I mean, someone ________it.
A.will have stolenB.might have stolen
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