―Look! What a mistake! Why? ―Sorry, I _________ on it. A. don’t concentrate B. hadn’t concentrated ...
2023-02-10 03:21:33 57次 四川省成都外国语学校2010-2011学年高三9月月考 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
―Look! What a mistake! Why?
―Sorry, I _________ on
it.
A. don’t
concentrate
B. hadn’t concentrated
C. haven’t been
concentrating D.
wasn’t concentrating
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