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
本題考查動詞用法。doubt在肯定句中用關(guān)系詞whether/if，在否定句中用關(guān)系詞that,故選D。
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