While watching television .A. the doorbell rangB. the doorbell was rungC. we heard the d

问题补充：

While watching television, .

A. the doorbell rang

B. the doorbell was rung

C. we heard the doorbell ring

D. we heard the doorbell rings

答案：

A. the doorbell rang

B. the doorbell was rung

(答案→)C. we heard the doorbell ring

D. we heard the doorbell rings

解析：

这题考察分词做状语的用法，当主从句主语一致时，可以省略主句中的主语可be动词，这题的从句中就省略了主语和be动词，说明主句的主语也是watch的发出者，只能选C。因为hear sb do。