问题
选择题
There are many people downstairs. What do you think ______?
A.to happen
B.happening
C.is happened
D.has happened
答案
答案:D
考查时态。句意“楼下有很多人,你觉得发生什么了?”happen不能用于被动语态;排除C;B项缺少is而不能构成现在进行时,排除B;不定式to do不能直接作谓语,排除A。故选D。