I was doing my homework _______ a dog came in.

A.when B.while
C.a(chǎn)s D.At

A

解析試題分析:句意為:一只狗進(jìn)來的時候我正在做作業(yè)。這是一個時間狀語從句,當(dāng)主句的動作是持續(xù)性的,而從句動作是短暫性的,此時用when引導(dǎo)時間狀語從句,主句用過去進(jìn)行時時,從句用一般過去時。當(dāng)主句的動作是短暫性的,從句的動作是持續(xù)性的,此時用while引導(dǎo)從句,主句用一般過去時時,從句用過去進(jìn)行時。故選A。
考點:考查連詞的用法。

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