【題目】—Why didn’t you go to play football with us yesterday afternoon?

—I my mother with the housework then.

A. helped B. was helping

C. had helped D. have been helping

【答案】B

【解析】

試題分析：句意：句意：－昨天下午你為什么不和我們去踢足球呢？－那時我正幫我母親做家務。表示過去的時間正在做某事，用過去進行時。故選B。

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