组卷网 > 高中英语综合库 > 语法 > 词法 > 情态动词 > 情态动词+have done > can’t/couldn’t have done的用法
题型:单项选择 难度:0.4 引用次数:331 题号:17887299
—That lecture was a boring and confusing one.
—Then it       Dr. Kevin’s because he is so interesting and fascinating. It       Dr. Jaco’s, he is just that type of person.
A.couldn’t have been…must beB.couldn’t be…can be
C.mustn’t be…can’t beD.can’t have been…must have been

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