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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 【查看更多】

 

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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

查看答案和解析>>

 ―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

查看答案和解析>>

―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

查看答案和解析>>

―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

查看答案和解析>>

 ―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

 

查看答案和解析>>


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