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— I called you at six last night, but you didn’t pick up.
— Oh, I ________ my mom ________ in the kitchen.

A．helped; to cook B．helped; cooking
C．was helping, cook D．was helping; cooking

C

解析試題分析：句意：我昨晚六點給你打電話，但是你沒接。噢，我正在廚房里幫媽媽。help sb. do/to do sth.幫助某人做某事，help后跟動詞原形或不定式都可以，過去進行時用was helping，故選C。
考點：考查過去進行時。

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