While i was reading i heard someone----at the door of partie

问题描述:

While i was reading i heard someone____at the door of parties
A knocked B knocks C to knock D knock
1个回答 分类:英语 2014-11-11

问题解答:

我来补答
选A
意思是:当我正在读书时我听到有人敲门
前后时态应保持一致,前文用was,(is的过去式),后文自然也用过去式,用knocked,同时,看书为持续性动作,所以用过去进行时(was/were doing),而敲门是短暂性动词,自然用过去式.
 
 
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