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模拟题2-39Since the ground is covered with thick snow,it ______

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模拟题2-39
Since the ground is covered with thick snow,it _________ heavily
last night.
A.must be snowing B.must have snowed
C.had snowed D.must have been snowed
请详细写出解题的过程和思路.
模拟题2-39Since the ground is covered with thick snow,it ______
B
对肯定的推测 用must
下雪时一个过去的时态 并且主动
A错 不是进行 D错 不是被动语态 C错 是对过去事情的推测