—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
B
過去進(jìn)行時的用法。句意：－昨天下午你為什么不和我們?nèi)ヌ咦闱蚰�？－那時我正幫我母親做家務(wù)。表示過去的時間正在做某事，用過去進(jìn)行時。故選B。
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