题目内容：

That is a good book.You () it yesterday选哪个
That is a good book.You () it yesterday.
a could buy b should buy c should have bought d bougt

优质解答

这个是虚拟语气的一种 选C 表示与过去事实相反的情况从句：If 主语+had+done主句：主语+should/would/could/might+have done　eg：1． If I had got there earlier,I should/could have met her. 如果我早到那儿,我...