A. | was helping | B. | were helping | C. | helped | D. | help |
分析 當我的媽媽正在洗碗的時候,我正在廚房幫她.
解答 答案:A.結(jié)合While my Mom was doing the dishes,可知兩個動作發(fā)生在過去,同時進行,故用過去進行時was/were+doing,主語I,故was,故答案是A.
點評 在復合句中,如果主要動作和背景動作都是延續(xù)的或同時發(fā)生的,那么主從句的動詞都可用過去進行時.例如:
While he was waiting for the bus,he was reading a newspaper.他邊等車邊看報. (兩個動作都是延續(xù)的) He was cleaning his car while I was cooking.他擦車時我在做飯.(兩個動作同時進行)
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