Question

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

Answer 1

C

動(dòng)詞不定式作定語(yǔ)時(shí)要放在所修飾詞的后面，whether to do是如何去做的意思，what to do是做什么的意思。It是我們做的對(duì)象，我們應(yīng)是不知道是否去做，所以選C.