The streets are wet,it must __________last night.rain have rained be raining have been raining 选哪个,

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The streets are wet,it must __________last night.rain have rained be raining have been raining 选哪个,
The streets are wet,it must __________last night.
rain
have rained
be raining
have been raining 选哪个,

The streets are wet,it must __________last night.rain have rained be raining have been raining 选哪个,
have rained

have rained
must have done 表示对过去的推测。