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,
x) HU(.)JM-)VH,JU(O-,Q--.QD 7/3=D(13O!#,UJMQH2!Iyp O'zcMR>鶁u YPv61><;3ldir+)y /xd;_oڷg}+m~ЄdV

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。