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 |
D
解析
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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 |
D
解析