42. —The ground is wet .—It must have just rained , _____________ ?A . hasn’t it B . didn’t it C . mustn’t it D . isn’t it

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42. —The ground is wet .—It must have just rained , _____________ ?A . hasn’t it B . didn’t it C . mustn’t it D . isn’t it
42. —The ground is wet .—It must have just rained , _____________ ?
A . hasn’t it B . didn’t it C . mustn’t it D . isn’t it

42. —The ground is wet .—It must have just rained , _____________ ?A . hasn’t it B . didn’t it C . mustn’t it D . isn’t it
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

a

a

A . hasn’t it
must 在此表示猜测,不参与反意疑问