I am very grateful to you for your assista
已帮助 人
I am very grateful to you for your assistance.
A:helpful B:hopeful C:pitiful D:thankful
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答案：D
grateful和thankful都有“感谢的”意思。helpful“乐于助人的”，例如：He is very helpful．他喜欢帮助人。hopeful“有希望的”，例如：The economic situation looks very hopeful anyway．不管怎么说，经济形势是乐观的。pitiful“可怜的”，例如：The old sick man is very pitiful．这个有病的老人太可怜了。