When______his homework，he heard someone singing．A、he doesB、he doingC、doingD、d

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问题 When______his homework，he heard someone singing．

选项 A、he does
B、he doing
C、doing
D、did

答案 C

解析由when等引导的状语从句，如果从句主语与主句的主语一致或是it，从句谓语动词又含be动词时，主语和be动词常常被省略，就变成“when+v-ing/v-ed/adj. /介词词组”的结构。

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