组卷网 > 高中英语综合库 > 单词辨析 > C > could
题型:单项选择 难度:0.65 引用次数:53 题号:22349080
During our trip to the Great Wall last week, I couldn’t stop thinking about how huge a project it ________ have been to build it in ancient times.
A.mustB.couldC.shouldD.need

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