I know ______ is important to know my own limitations but _______ is difficult is to help others to

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I know ______ is important to know my own limitations, but _______ is difficult is to help others to know their own limitations.

A.it, itB.what, what
C.it, whatD.what, it

热搜:关于氨基酸代谢错误的论述是_________。