2. 外语
  3. The temperature ______ below zero last night because the water is frozen all over.

The temperature ______ below zero last night because the water is frozen all over.

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问题 The temperature ______ below zero last night because the water is frozen all over.
选项 A、had dropped
B、must have dropped
C、would have dropped
D、must drop
答案B
解析 “must+现在完成时”可以表示对过去已经发生的事件的推测，符合本题的题意。“would+现在完成时”是虚拟语气的用法之一，用于表示过去可能发生却没有发生的事件。
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