He is wet to the skin. It ______ heavily.

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问题 He is wet to the skin. It ______ heavily.

选项 A、must be raining
B、must rain
C、may be raining
D、must have rained

答案A

解析 注意A和D的区别。Amust be raining对当前的肯定猜测。Dmust have rained对过去的肯定猜测。
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