---Look Such heavy traffic

问题描述:

---Look Such heavy traffic
---I double ____ or not I can get to school on time.
A.if B.when C.whether D.why
请说明此题考点和每个选项的区别

选择C,考察whether 的用法,这个句子用到的是whether or not的用法,if不能与not连用,而另外两个词完全与句子意思不符合