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 Inthe1950sintheUSA,mostfamilieshadjustonephoneathome,a...

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問題詳情：

 Inthe1950sintheUSA,mostfamilieshadjustonephoneathome,a...

 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

知識點：動詞時態與語態

題型：選擇題

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