130.Loudspeakers were fixed in the hall so that everyone________ an opportunity to hear the speech.

　ought to have

　must have

　may have

　should have

正确答案：C

解析：

解析:may. 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 have done表示对过去的肯定猜测.

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