Since the ground is wet, it ______ last night.

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问题 Since the ground is wet, it ______ last night.

选项 A、must have rained
B、had rained
C、must rain

答案A

解析 本句意为“因为路面上很潮湿,所以昨天晚上肯定下雨了”。这是虚拟句。
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