While I a book.there was a knock at the door． A．read B．am reading C．was reading ——青夏教育精英家教网——

题目内容

While I ________ a book，there was a knock at the door．

A．read B．am reading C．was reading D．readed

试题答案

1、C

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While I ________ a book，there was a knock at the door．

A．read B．am reading C．was reading D．readed

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