While watching television, .A．the doorbell rangB．we heard the doorbell ring C．there was someone knocking at the doorD．the doorbell was ringing 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．we heard the doorbell ring
C．there was someone knocking at the door	D．the doorbell was ringing

这题考查状语从句的省略式，由前面的While watching television可知省略了sb was，所以几个选项中，选主语是人的就可以了，所以B正确，句意是：当看电视时，我们听到门铃响了。选B。

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