I my mum cook dinner in the kitchen when the telephone .A. helped; was ringringB. helped;

I my mum cook dinner in the kitchen when the telephone .
A. helped; was ringring
B. helped; rang
C. was helping; rang
D. was helping; was ringing

A. helped; was ringringB. helped; rang(答案→)C. was helping; rangD. was helping; was ringing解析：句意：我正在厨房帮妈妈做饭这时电话铃声响了。表示过去某时正在进行的动作使用过去进行时。表示某一动作发生在过去用一般过去时。所以选C。

这个问题的回答的对