While watching TV .A. the doorbell rangB. the doorbell ringsC. we heard the doorbell ring

问题补充：

While watching TV, .

A. the doorbell rang

B. the doorbell rings

C. we heard the doorbell ring

D. we heard the doorbell rings

答案：

A. the doorbell rang

B. the doorbell rings

(答案→)C. we heard the doorbell ring

D. we heard the doorbell rings

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