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    -Mr. Smith, I can’t go on with my reading. -I’ve already told you the last three parts of the article the most difficult to understand. A. is B. are C. had been D. were 【查看更多】

     

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    ―Mr. Smith, I can’t go on with my reading.

    ―I’ve already told you the last three parts of the article ____ the most difficult to understand.

    A. is                   B. are                C. had been             D. were

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