We really don't know_______.()

问题描述:

We really don't know_______.()
A.which one to choose B.which one choose
C.to choose what D.to choose which one

选A
句意:我们确实不知道选哪一个.
don't know后面只能加名词动名词等等
就先排除C,D
而which one to choose 就和what to do之类的一样
可以用作固定句式,常考