Loudspeakers were fixed in the hall so that everyone______an opportunity to hear

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问题 Loudspeakers were fixed in the hall so that everyone______an opportunity to hear the speech.

选项 A、ought to have
B、must have
C、may have
D、should have

答案 C

解析 may have。so that引导目的状语从句，表示为了让每个人都有机会听到讲座。其他选项均不符合题意。ought to have done=should have done本应该做而实际未做，must havedone表示对过去的肯定猜测。

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