While watching television, . A．the doorbell rang B．the doorbell rings C．we heard the doorbell ring D．we heard the doorbell rings 题目和参考答案——青夏教育精英家教网—

题目内容

While watching television, __________.

A．the doorbell rang B．the doorbell rings

C．we heard the doorbell ring D．we heard the doorbell rings

【答案】

【详解】考查非谓语动词。主从句主语一致，从句谓语动词含are可将从句主谓结构you are省略。While we were watching television, you were 省略，hear sb/sth do sth,故选C

【详解】考查非谓语动词。主从句主语一致，从句谓语动词是be且主语与主句的主语一致可将从句主谓结构sb. + be省略。While we were watching television, 省略we were，又因为hear sb/sth do sth,所以答案选C

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