题目内容

I don’t doubt_______ he took the first place in his class; but I do doubt_______ he will succeed in the end.
A.if; thatB.but; whichC.whether; whetherD.that; whether
D
本题考查动词用法。doubt在肯定句中用关系词whether/if,在否定句中用关系词that,故选D。
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