We never doubt ___David told us the truth,but we really doubt ___Daniel told us the truth
问题描述：
We never doubt ___David told us the truth,but we really doubt ___Daniel told us the truth
A if whetherB whether that C whether ifD thatwhether
答
选D.
第一个that从句说明相信,坚信,从未怀疑.这是陈述语气
第二个whether从句说明怀疑daniel是否对我们说了实话.这是疑问的语气
翻译：我们一直坚信戴维不会对我们撒谎,但是我们真的怀疑丹尼尔是否对我们说了实话