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

這題考查狀語從句的省略式，由前面的While watching television可知省略了sb was，所以幾個選項(xiàng)中，選主語是人的就可以了，所以B正確，句意是：當(dāng)看電視時，我們聽到門鈴響了。選B。
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