[题目]-I called you at 8:00 p.m yesterday, but you didn’t pick up.-Oh, I mom with housework.A. am helping B. helped C. was helping D. will help 题目和参考答案——青夏教育精英家教网—

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【题目】—I called you at 8:00 p.m yesterday, but you didn’t pick up.

—Oh, I _________ mom with housework.

A. am helping B. helped C. was helping D. will help

【答案】C

【解析】句意：——我昨天晚上8点给你打电话，但是你没接。——我在帮妈妈做家务。根据句意在昨天晚上8点，可以判断用过去进行时态，结构是：were/was+doing；故选C

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