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LoudspeakerswerefixedinthehallsothateveryoneDanopportunitytohearthespeech.AoughttohaveBmusthaveCmayhaveDshouldhave为啥不选a

题目详情
Loudspeakers were fixed in the hall so that everyone_D_ an opportunity to hear the speech.
A ought to have B must have C may have D should have
为啥不选a
▼优质解答
答案和解析
D =could have 表示有能力,有条件
A 应该可以,扩音器修好了不能为了应该可以.