这里的 must have rained是 must + 完成时态,
表示肯定地猜测,理解为 一般过去时,就是rained
所以,答案B
肯定猜测：must be
可能猜测：may be
不可能：can't be
这三个用于一般现在时
42. —The ground is wet .—It must have just rained , ________
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