问题
选择题
I was doing my homework _______ my father was reading newspapers.
A. how B. while C. if
答案
答案：B
题目分析：句意：当我爸爸在读报纸时，我正在做作业。while正当……时候。故选B。
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I was doing my homework _______ my father was reading newspapers.
A. how B. while C. if
答案：B
题目分析：句意：当我爸爸在读报纸时，我正在做作业。while正当……时候。故选B。