单项选择题

A. could haveB. might haveC. might have hadD. must have……

—I wonder why Mr. Green looks quiet in class.
—I'm not sure, but he（）a small accident driving here.

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

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A. settled
B. to be settled
C. settling
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A.by that
B.with that
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A.is standing
B.are standing
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A.wins
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