What do you think ____ (happen)?A to happen B happening C is happened D has happened

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What do you think ____ (happen)?A to happen B happening C is happened D has happened

D has happened
do you think 是插入语,不影响句子结构.
此句缺少谓动,只能在CD中选择,
happen是不及物动词,没有被动语态,因此只能选D.

D
A B C都有语法错误

选d.
do you think 是插入语,可以省略,因此就可以说成 what has happened?
类此做插入语的还有一些动词:believe, suppose,等。
不懂再追问哦!