个人观点：这题目有问题的,不当之处欢迎探讨,共同进步!
B/D均可.
The child at the back craned forward to see what was happening.x05
后面的孩子探出头看看出了什么事.
I don't know what's going on.x05
我不知道发生了什么事.
表示过去某时间正在发生的是用was going on 还是was happening
2个回答
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