I was on the highway when this car went past followed by a police car. They _____

I was on the highway when this car went past followed by a police car. They ______ at least 150 kilometers an hour.

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should have been doing

must have been doing

could have done

would have done

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The captain urged that the mission ______ before dark.

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must be finished

be finished

ought to be finished

was finished

Even though I’d hurt my leg, I＿＿＿＿＿＿ swim back to the river bank.

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could

might

had to

was able to

(2013·高考安徽卷)I________ to my cousin’s birthday party last night，but I was not available.

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went

had gone

would go

would have gone

David did not regret saying what he did but felt that he     it differently.

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could express

would express

could have expressed

must have expressed

、To our great surprise, the disabled person made a requirement that he        as a volunteer

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received

was received

be received

would receive

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