Question

_____that is important is that you are doing your best and moving in the right direction.

A.One B.All C.Everything D.Anything
解释一下，不要讲得太深奥。
句子是缺成分还是固定词组？谢谢
对了，我的印象中老师好像说过All that=what
对么？？？

Answer 1

选B
缺成分，缺主语
含义：你正在尽全力朝着正确的方向努力才是最重要的！
句子主干是All is that+从句。主语是all，其作用有点像于代词，如同 it is a book中的it，只不过该句中all指代的是that引导的一个从句you are doing your best and moving in the right direction，从句在句中的成分是宾语。
that is important是all的定语从句。

all that is important is ....是一种惯用结构，也不能说固定搭配，类似的结构还有，all that i can do is to tell you the truth,我所能做的就是告诉你真相(此处用的是不定时作宾语)，all i want is a ipad.等等。。。

Answer 2

B. All
All that is important is that you are doing your best and moving in the the right direction
在这儿的all意思是‘最’ 重要