since the mountain is white,it ----last night.A.must be snowing B.must snowC.must have snowed D.must have been snowed这题的答案是D,为什么了,我选的是A.

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sincethemountainiswhite,it----lastnight.A.mustbesnowingB.mustsnowC.musthavesnowedD.musthavebeensnowe

since the mountain is white,it ----last night.A.must be snowing B.must snowC.must have snowed D.must have been snowed这题的答案是D,为什么了,我选的是A.
since the mountain is white,it ----last night.
A.must be snowing B.must snow
C.must have snowed D.must have been snowed
这题的答案是D,为什么了,我选的是A.

since the mountain is white,it ----last night.A.must be snowing B.must snowC.must have snowed D.must have been snowed这题的答案是D,为什么了,我选的是A.
因为是昨天晚上的事,而且从前句那句可以知道山已经是白色,所以可以推断出雪已经下了,应该用现在完成时.所以选择答案D

D.must have been snowed
既然山是白了,那么昨晚一定下雪了.
A昨晚一定正在下雪.
A的意思不太通.这里并不强调什么正在,而是强调一个有影响的结果.

D一定是被雪覆盖