we ()last night ,but we went to the concert instead

问题描述:

we ()last night ,but we went to the concert instead
a.must have studied b.might studyc.should have studied d.would study

选C.
should have done 的意思是本应该做某事,符合语境.
翻译:昨晚我们本应该学习的,但是我们却去了看音乐会.
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