We don’t know it next. Let’s go and ask Mr. Li.A. what to doB. to do whatC. whether to do

We don’t know it next. Let’s go and ask Mr. Li.
A. what to do
B. to do what
C. whether to do
D. to do whether

A. what to doB. to do what(答案→)C. whether to doD. to do whether解析：考查宾语从句.句意:我们不知道接下来是否做这件事.从句中不缺少宾语,故选C.

就是这个解释