Mr. Smith complained about the ______ air-conditioner he had bought from the company.

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问题 Mr. Smith complained about the ______ air-conditioner he had bought from the company.

选项 A、infectious
B、deficient
C、ineffective
D、defective

答案D

解析 defective有缺陷的,有瑕疵的。infectious传染的;有感染力的。deficient不足的,缺乏的。ineffective无效的,不起作用的。
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