Ihappened____thisbookbefore.A.havingreadB.tohavereadC.readD.reading
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题目内容:
I happened ____ this book before.A.having read B.to have read C.read D.reading
优质解答
B
happen to do sth
固定搭配~
由于句子中有before,所以用have done的完成时~
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