The river is rising.It last night.A.must be raining B.must rain C.mighthave rained D.must have rained

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The river is rising.It last night.A.must be raining B.must rain C.mighthave rained D.must have rained

The river is rising.It last night.A.must be raining B.must rain C.mighthave rained D.must have rained
The river is rising.It last night.
A.must be raining B.must rain C.mighthave rained D.must have rained

The river is rising.It last night.A.must be raining B.must rain C.mighthave rained D.must have rained
D.must have rained
对过去的事情作以肯定推测,用must(may)+ have + 过去分词