Since the stream is full of water,_________last night.

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问题 Since the stream is full of water,_________last night.

选项 A、it must have rained
B、there might have rained
C、it must be raining
D、there might have been rain

答案A

解析 Since the stream is full of water,it must have rained last night.溪里的水都满了,昨晚一定下过雨。指天气,主语一定用it。
f must+V.表“对现在肯定事实的推测”。
mus+have+P.P.表“对过去肯定事实的推测”。
stream[stri:m]n.溪流
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