| A. | was helping | B. | were helping | C. | helped | D. | help |
分析 当我的妈妈正在洗碗的时候,我正在厨房帮她.
解答 答案:A.结合While my Mom was doing the dishes,可知两个动作发生在过去,同时进行,故用过去进行时was/were+doing,主语I,故was,故答案是A.
点评 在复合句中,如果主要动作和背景动作都是延续的或同时发生的,那么主从句的动词都可用过去进行时.例如:
While he was waiting for the bus,he was reading a newspaper.他边等车边看报. (两个动作都是延续的) He was cleaning his car while I was cooking.他擦车时我在做饭.(两个动作同时进行)
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