2. 外语
  3. Since the ground is wet, it ______ last night.

Since the ground is wet, it ______ last night.

admin2011-01-14  22
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 此题考查情态动词的用法。must have done表示对过去某事的推测。
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