问题

Look, so many people are running out of the station. I wonder what ________.

A:is happened
B:was happening
C:is happening
D:had happened

正确答案是：

标签： look , many , so

同类题型

The accident happened_____ a cold wet morning.[ ]

It has become a great place __________.[ ]

She has ____ hair.

______ is no _______ arguing with Bill because he will never change his mind.

Look! It is _______so_______!