Although most of them have no doubt he will pass the exam, I still wonder he has really

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A. whether; that
(答案→)B. that; whether
C. that; that
D. whether; whether
解析：考查同位语从句和宾语从句，句意：虽然大部分人不怀疑他会通过考试，我还是想知道他是否都准备好了。第一空是同位语从句，先行词是doubt，因为是否定句，所以是that连接同位语从句，第二空是根据句意判断用whether连接宾语从句。选B。