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    31．The halls are lined on three sides with rows of elevated benches overlooking a raised seat to have been used by a lecturer to address students. A．thinking B．thought C．is thinking D．is thought 【查看更多】

     

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    The halls are lined on three sides with rows of elevated（逐步抬高的） benches overlooking a raised seat ____ to have been used by a lecturer to address students.

    A．thinking   B．thought   C．is thinking      D．is thought

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