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The house is dirty because it ________ since they moved out.
A.doesn't cleanB.isn't cleaned
C.hasn't cleanedD.hasn't been cleaned
D
D 考察动词时态和语态。句义:—房子很脏,因为自从他们搬出去以后就没有打扫过。空格处于主语the house之间是逻辑上的被动关系,由此可以排除AC项。根据句中的状语since they moved out,并结合语境可知,空格处应该使用现在完成时,表示过去发生的某一动作对现在语境造成的影响或结果。故D正确。
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