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We were glad that by the time we got there the play ___yet

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We were glad that by the time we got there the play ___yet
选hasn't begun还是hadn't begun 为什么
We were glad that by the time we got there the play ___yet
应该选择后者,即:hadn't begun hadn't begun 的完整形式应该是:had not begun,而 had not begun 是 has not begun 的过去式形式.has not begun 一般是完成时,表示现在已经做完的动作,题中的前一个选项 hasn't begun 就是这个.不过从这个题目可以看出,这是一个过去时的句子,所以要将 has 变成 had ,也就是说将现在完成时变成过去完成时.所以选择后者.