He hopes that the little favor________he has been able to do does good to them.

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问题 He hopes that the little favor________he has been able to do does good to them.

选项 A、what
B、that
C、when
D、where

答案B

解析 他希望他帮上的小忙对他们有用。定语从句题。根据句意可知,本题需要选的是定语从句的引导词。当先行词为物,在定语从句中作主语、宾语、表语等成分,并且被all、little、few、much、anything、everything、nothing等修饰时,只能用that引导该定语从句。原句的先行词favor被little修饰,引导词在定语从句中作do的宾语,所以只有B项符合条件。选项A的what不能引导定语从句;C项when和D项where必须在定语从句中作状语。
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