I was doing homework ________ he came in.

[　　]

A．when
B．while
C．a(chǎn)s
D．before

答案：A
解析：

考查同義詞辨析。when引導(dǎo)時間狀語從句，單純表示時間，從句中謂語動詞可以是表示延續(xù)性動作的也可以是表示短暫性動作的；while引導(dǎo)時間狀語從句強(qiáng)調(diào)主句中謂語動詞貫穿于從句所指的整個時間段，且從句中的動詞要用延續(xù)性動詞。如：I kept silent while he was writing.他寫的時候，我默不作聲。as引導(dǎo)時間狀語從句，強(qiáng)調(diào)主句與從句動作同時發(fā)生。

如：She sang as she went along.她邊走邊唱。

before表示“在……之前”。由以上可知A項(xiàng)正確。


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