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there are many people over there .i wonder what's __Agoing B going on C going at D goingin

题目详情
there are many people over there .i wonder what's __
Agoing B going on C going at D goingin
▼优质解答
答案和解析
选B. going on.
What's going on= what’s happening?
发生了什么?怎么了?