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
---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
问题解答：
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