Now we know what-----yesterday.A.was happened B.happened C.h

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Now we know what-----yesterday.A.was happened B.happened C.happeningD.has happened 为什么选B

Now we know what-----yesterday.
A.was happened B.happened C.happeningD.has happened
答案：B
解析：句中有明确的时间状语：yesterday.整个句子是一个宾语从句,而且整句的时态是现在时,所以宾语从句可以有自己的时态,在这个题中就要和yesterday配合.A选项,happen是不及物动词,所以不能用被动语态（即A）,C选项缺be动词,ing分词不能单独作谓语,D是现在完成时,和yesterday的时间状语不搭配.
句意：现在我们知道了昨天发生了什么.

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