B happened
我不知道操場上(剛才)發(fā)生了什么事
要被動語態(tài),因為是什么被發(fā)生了,如果D的話,你不能有 was.
be+V 過去分詞為被動語態(tài)!
I don't know what was ___ on the playground
I don't know what was ___ on the playground
A.happen B happened C chappens D happening
A.happen B happened C chappens D happening
英語人氣：383 ℃時間：2020-03-29 22:46:46
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