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    ―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

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     ―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

     

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