We don not know()it next.Let us go and ask Mr.Li.

问题描述:

We don not know()it next.Let us go and ask Mr.Li.
A.what to do
B.to do what
C.whether to do
D.to do whether
为什么?

C
疑问词跟不定式结构,所以先排除B和D;what to do 后不跟it
我们不知道接下来是否要做(这件事)