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The earthquake ____ when I ____ some cleaning.
A.starts, was doingB.started, was doing
C.was starting, was doingD.starts, were doing
B

试题分析:本句的意思是“当地震发生的时候,我正打扫卫生。”,根据意思可知,本句应该用过去时,故排除AD;start是一个非延续动词,所以不能用进行时表示“正在开始”,故排除C。所以本题选B。
点评:对于时态的问题,需要先判断句子中动词发生的时间,根据时间来确定相应的时态。当然,还应注意动词本身的特性,如延续性动词和非延续性动词等。
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