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    These trees must have been planted three years ago, ? A. weren’t they B. mustn’t they C. didn’t they D. haven’t they 【查看更多】

     

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    These trees must have been planted three years ago, ___________?

    A. weren’t they  B. mustn’t they C. didn’t they  D. haven’t they

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    These trees must have been planted three years ago, ___________?

    A．weren’t they       B．mustn’t they        C．didn’t they        D．haven’t they

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