Question

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

Answer 1

C

解析试题分析：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。
考点：考查动词时态。