While watching television .A. the doorbell rangB. the doorbell ringsC. they heard the doo

问题补充：

While watching television, .

A. the doorbell rang

B. the doorbell rings

C. they heard the doorbell rings

D. they heard the doorbell ring

答案：

A. the doorbell rang

B. the doorbell rings

C. they heard the doorbell rings

(答案→)D. they heard the doorbell ring

解析：考查句子结构。“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。句意：当看电视的时候，他们听到门铃响了。故D正确。