Inthe1950sintheUSA,mostfamilieshadjustonephoneathome,an...
问题详情:
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
【回答】
【*】D
【解析】考查时态。句意:在美国20世纪50年代的时候,大多数的家庭家里只有一部电话,并且无线电话还根本没有发明出来。根据句意可知用被动语态,排除A和C,事情发生在过去,与现在无关,排除B,故选D。KS5U
知识点:动词时态与语态
题型:选择题
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设,若,则a=( )A.-1 B.0 C.2 D.3
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2003年楚人学舟楚①人有习*舟者,其始折旋②疾徐,惟舟师之是听。于是小试洲渚之间,所向莫不如意,遂以为尽*舟...
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下列元素原子半径最大的是 ( )A、Li B、F C、Na D、Cl
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