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When doing my homework,________.
A.I heard the doorbell ringB.the doorbell rang
C.my mother came inD.my mother was cooking
A

试题分析:考查状语从句的省略和宾语补足语:句意:当做作业的时候,我听见门铃响了。“while”后接的是现在分词短语,在句中作状语,它逻辑上的主语应该是我,不是the door,也不是my mother,又因为hear后接复合宾语时,这个复合宾语应包含一个省略to的动词不定式或现在分词短语。所以本题选A项。
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