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
【正确答案】：C
【题目解析】：do you suppose 是插入语。What has happened?发生了什么?
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