摘要：26．―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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25. ―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
查看习题详情和答案>>―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
查看习题详情和答案>>―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
查看习题详情和答案>>