Question

I hope_______the little______i have been able to

I hope_______the little______i have been able to do has been of use A：that；that B：/；by which C：what；what D：/；with which

Answer 1

A 第一个that是引导宾语从句，做hope的宾语，可省略。后面的tha i have been able to do 是修饰不定代词little的定语从句。因为the little是不定代词，只能用that引导。
句意为：我希望我能做的那一点点能够有些用处。

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可以

Answer 2

选A。
I hope that后面是宾语从句（中间的东西下面讲）has been of some use.
the little（that） I have been able to do
我希望,我能够做到的那一点点,会有些用.

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3Q