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5. I am not sure if he will come
costed them 因为是过去式所以要加ed
costed them 因为是过去式所以要加ed
He paid 20 yuan for this book.He spent 20 yuan on this book.He spent 20 yuan buy
He paid 20 yuan for this book.He spent 20 yuan on this book.He spent 20 yuan buy
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