---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

---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
---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

---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

if和wether的区别在于
1 在动词不定式之前只能用whether
2 在whether …… or not 的固定搭配中。
3 在介词后，只能用whether。
4宾语从句放在句首表示强调时，只能用whether 。
5用if会引起歧义时，只用whether。如用whether可避免歧义。

Whether or not 是否。

I doubt whether or not I can get to school on time.