Most of the students felt rather disappointed at the English party. They say tha

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问题 Most of the students felt rather disappointed at the English party. They say that it ______ better organized.

选项 A、had been
B、had to be
C、must have been
D、could have been

答案 D

解析 虚拟语气。could have done sth.表示“本来能够做某事而实际上未能做成”。
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