It __________ last night for all the trees are covered with snow now.

It __________ last night for all the trees are covered with snow now.

题目
It __________ last night for all the trees are covered with snow now.
A.must have snowed B.should have snowed
C.may have snowed D.ought to have snowed
答案
It __________ last night for all the trees are covered with snow now.A.must have snowed B.should have snowedC.may have snowed D.ought to have snowed选项是Amust have snowed表推测【昨晚一定下了雪】,根据...
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