there is a crowd of people in front of the house over there.what do you suppose ____?

there is a crowd of people in front of the house over there.what do you suppose ____?
A happened B happening C has happened D to have happened
请说明原因
正确的是C,不理解
英语人气:834 ℃时间:2019-09-23 08:47:41
优质解答
A.
do you suppose 是插入语.What happened?发生了什么?
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