2. 外语
  3. The streets are all wet. It ______ last night.

The streets are all wet. It ______ last night.

admin2009-06-28  17
问题 The streets are all wet. It ______ last night.
选项 A、must be raining
B、must have been raining
C、had to rain
D、must have rained
答案D
解析 该句是对过去事实的肯定推测。“must have done”结构表示对过去事实的推测，但只用于肯定句中，如果是否定句，应用“cannot”或“couldn’t”，而不是“must not”。例如：They cannot have arrived here yesterday for the party，for this room was so quiet then． (他们昨天肯定没来这开晚会，因为那时屋里很安静。)
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