Question

---Look! Such heavy traffic!
--- I doubt _________ or not I can get to school on time.

A．if

B．when

C．whether

D．why

Answer 1

C  

试题分析: 句意：看，路太堵了！我怀疑我们能不能准时到校。宾语从语中有or not 只能用whether，不能用   if,故选C。