they sang happily .they must ______ the examination
为什么这么用啊 must+had passed是什么用法啊
人气：419 ℃ 时间：2020-04-17 16:28:12
解答
had passed 是正确的
因为第一句是过去式,他们唱歌唱得很开心.
所以通过考试是在过去的某个时间点前发生的,用过去完成时态
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