1.I, for one, never doubted that he was a professional.
我，作为其中的一个，从来没怀疑过他不是个行家。
2.They doubted whether all this work would pay off.
他们怀疑这样干是否划得来。
3.She said she doubted the birds were poisoned.
她怀疑这些鸟儿有可能是中毒而死。
4.We have never doubted of the success of our experiment.
我们对我们的实验会获得成功从未怀疑过。
5.Sometimes, he doubted whether he could see them again.
有时候，他怀疑自己是否还能见到他们。
6.From start to finish, never doubted that the Love.
从头到尾，从未怀疑过这二人的爱情。
7.He doubted drought alone would force Northlanders off their farms.
他怀疑仅仅干旱会迫使北国人离开他们的农场。
8.No one doubted his ability.
没有人怀疑他的能力。
9.You so often have doubted yourselves.
你们是如此频繁地怀疑自己。