It ____ an hour ago .The road is wet.(rain).

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It____anhourago.Theroadiswet.(rain).It____anhourago.Theroadiswet.(rain).It____anhourago.Theroadiswet

It ____ an hour ago .The road is wet.(rain).
It ____ an hour ago .The road is wet.(rain).

It ____ an hour ago .The road is wet.(rain).
It _rained___ an hour ago .The road is wet.(rain).

rained

rained

rained

rained

It must rain an hour ago .The road is wet.(rain).
对过去发生的事情的肯定推断

rained已经过去....
或者 has been raning from
但是考试的话就是rained