---Look! Such heavy traffic!
--- I doubt _________ or not I can get to school on time.
A．ifB．whenC．whetherD．why
C  

試題分析: 句意：看，路太堵了！我懷疑我們能不能準(zhǔn)時到校。賓語從語中有or not 只能用whether，不能用   if,故選C。
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