单句改错
Parents were busy, so they couldn’t help cleaning the floor.
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You should pay especial attention to the sentence pattern.
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It is sure that he will win first place in the contest.
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It is pity that you have missed the wonderful film.
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The old couple, catching in the heavy rain, soon lost their way.
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He won’t possibly allow you smoking here, as he dislikes it.
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A bus ran into a car, which killed 20 passengers, containing 2 babies.
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He was last seen making up a story to add up to the book.
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