题目内容：

Everything depends on__we have enough time.
A:that b:how C:if D;whether

优质解答

D whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用.如：I wonder if / whether I can get some advice from you.Ask him whether / if he can come.但在有些情况下,whether和if的用...