Look, the trees are fallen; there ______ a strong wind last night.A、must beB、sh

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问题 Look, the trees are fallen; there ______ a strong wind last night.

选项 A、must be
B、should have been
C、must have been
D、could be

答案 C

解析看，树倒了，昨晚一定是刮大风了。本题后半句用的是there be句型，是对过去发生的事情的肯定推测，要用must have+过去分词的形式。

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