While watching television,________．

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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C
思路解析：“while”后接的是现在分词短语,在句中作状语,它逻辑上的主语应该是人,所以可以先排除A、B两项；又因为hear后接复合宾语时,这个复合宾语应包含一个省略to的动词不定式或现在分词短语.所以本题选C项.
绿色通道：用分词作状语时,如果分词没有带自己独立的逻辑上的主语,它逻辑上的主语就只能是句子的主语.如：Following the guide, they started to climb the mountain．(跟着向导的是they)．

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