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;

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空格wewereinbeijinglibrarythatday;a:ithappenedthat;b:itwashappenedthat如果b改成itwashappeningthat;空格wewere

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;
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;

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;
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)

:it happened that是常用表达,一般不用it was happening that