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13、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

13、B

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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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