◎ 题干
He _____ morning exercises yesterday. 
[     ]
A. wasn't do
B. didn't
C. didn't do
D. doesn't do
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He ______ morning exercises yesterday. [ ]A. wasn't do B. didn't C. didn't do D. doesn't do …”主要考查了你对  【助动词的过去式】【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。