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问题: The river is rising , it ____ last night .a .must

The river is rising , it ____ last night .a .must rain b. must have rained .答案是a ,我认为是b。既然是河水涨了,一定是已经下过了雨。

解答:

A应该是must rained吧。last night 是表示过去的时间,应与过去时连用。
如果是B的话,可以说it must have rained in the night(或during the night).