--What _ to them?--they appeared__in the accident.

问题描述:

--What _ to them?--they appeared__in the accident.
A.has happened to,be injured B.happened ,to have been injured
C.has happened to ,be injured D.happened ,injured

B
AC 后面都有to ,和后面的to明显重复.
而且我们在书上都有看见,what happened to you 对吧.
因为事件已经发生了,所以应该用完成时.
所以是 to have been injured