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I happend _it in some book.A.to read B.to have read C.that I

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I happend _it in some book.A.to read B.to have read C.that I have read D.that l had read
I happend (B.to have read) it in some book.
我碰巧在有本书中读到过它.
happen to do,碰巧做某事.不定式to do这里要用完成时态,表示到目前为止已经做过.
再问:
再答: 图像不清楚。
再答: 图像不清楚。