【題目】In the 1950s in the USA, most families had just one phone at home, and wireless phones _______ yet.

A. haven’t invented B. haven’t been invented

C. hadn’t invented D. hadn’t been invented

【答案】D

【解析】考查時態(tài)。句意：在美國20世紀(jì)50年代的時候，大多數(shù)的家庭家里只有一部電話，并且無線電話還根本沒有發(fā)明出來。根據(jù)句意可知用被動語態(tài)，排除A和C，事情發(fā)生在過去，與現(xiàn)在無關(guān)，排除B，故選D。

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