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题目
空格 we were in beijinglibrary that day; a :it happened that; b:it was happened that
如果b改成it was happening that;

提问时间:2020-07-13

答案
it happened that 从句(碰巧.)是一个固定句型,这个句型中主句不用进行时.
但可以说sth is happening(发生)
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