He hopes that the little favor______he has been able to do does good to them.A．whatB．thatC
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He hopes that the little favor______he has been able to do does good to them.
A．what
B．that
C．when
D．where
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
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等词修饰时，只能用that引导该定语从句。原句的先行词favor被little修饰，在定语从句中作do的宾语，所以只有选项[B]符合条件。选项[A]不能引导定语从句；选项[C]和[D]必须在定语从句中作状语。