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—I wonder why Susan looks worried today.
—I’m not sure, but she _____a small accident driving here.
A.could haveB.might haveC.might have hadD.must have had
C

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。
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