—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

試題分析：句意為：----我想知道，Susan今天為什么看上去很憂慮呢？----我也不清楚，但是他可能遇到了一點(diǎn)兒小車禍。 由后面的不太確定，可知應(yīng)為might, 因?yàn)樗瓷先n慮，所以事情應(yīng)該發(fā)生了，故應(yīng)為might have done.答案應(yīng)為C。
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