问题
选择题
It ____ last night, for the ground is wet now.
A．might not have rained
B．must have rained
C．couldn't have rained
D．rained
答案
答案：B
对过去的事情肯定推测应用：must have +过去分词。
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It ____ last night, for the ground is wet now.
A．might not have rained
B．must have rained
C．couldn't have rained
D．rained
答案：B
对过去的事情肯定推测应用：must have +过去分词。