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  Even though they are not doubtful at all _______ John will pass the exam, I still wonder ______ he is fully prepared.
A.whether; thatB.that; whetherC.that; thatD.whether; whether
B
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。
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