Even though they are not doubtful at all _______ John will pass the exam, I still wonder ______ he is fully preparedA.whether; thatB.that; whetherC.that; thatD.whether; whether
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B解析考查同位语从句。boubtful“怀疑的，有疑问的”，用于肯定句时，同位语从句用whether引导；用于否定句时，同位语从句用that引导；wonder“怀疑，想知道”，用whether引导宾语从句。故选B。