1 最佳答案是 which 没有的话 用one 来指代 前面的 a habit
2 B
all that's = what's= what is
主语从句
CA
第一题选d 哈，one是作habit的同位语哈，可以这样说Helping others is a habit,one that you can learn even at an eraly age.
同时That是learn的宾语，在定语从句中可以省略哈，希望有帮助
不缺 2.___选C___that's important is that you are doing your best and moving in the right direction
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