—I wonder why Susan looks worried today....

—I wonder why Susan looks worried today.

—I’m not sure, but she _____a small accident driving here.

A. could have B. might have C. might have had D. must have had

C 【解析】试题分析：句意为：----我想知道，Susan今天为什么看上去很忧虑呢？----我也不清楚，但是他可能遇到了一点儿小车祸。由后面的不太确定，可知应为might, 因为他看上去忧虑，所以事情应该发生了，故应为might have done.答案应为C。考点：考查情态动词的用法。

考点分析：

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