2. 外语
  3. It_____yesterday, for the ground is still wet now.

It_____yesterday, for the ground is still wet now.

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问题 It_____yesterday, for the ground is still wet now.
选项 A、must have rained
B、was raining
C、rained
D、had rained
答案A
解析 must have done表示对过去发生的事情的肯定推测。
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