—Why does Mary look so worried today?—I’m not sure, but she ____

—Why does Mary look so worried today?—I’m not sure, but she _____ a small accident driving here.

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must have

might have

must have had

might have had

推荐题目

The ground isn't wet. It ________ have rained last night.

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mustn’t

shouldn’t

wouldn’t

can’t

— When shall we meet your cousin at the station?— His plane took off two hours ago, and it        reach at 5 pm.

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should

could

must

can

 When Marx was in London, he  __   read at the library for hours.

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would

might

could

should

 — How’s your tour around the North Lake? Is it beautiful?— It ______ be, but it is now heavily polluted.

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will

would

should

Must

These books______very interesting. Many children like reading them.

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are