You are so clear about it; somebody ______ you.

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问题 You are so clear about it; somebody ______ you.

选项 A、would tell
B、ought tell
C、must have told
D、should told

答案C

解析 句意:你对此如此清楚,一定是有人已经告诉你了。这里注意must have told实际上是一种极其肯定的判断形式,即情态动词must后跟have done这种结构表判断。
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