作业帮When your friends are in trouble,you shonld do all___________them.A.you can help B.you can to help C.that you can helpD.what you can help重在讲解,不在答案（越具体越好）
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When your friends are in trouble,you shonld do all___________them.A.you can help B.you can to help C.that you can helpD.what you can help重在讲解,不在答案（越具体越好）
When your friends are in trouble,you shonld do all___________them.
A.you can help
B.you can to help
C.that you can help
D.what you can help
重在讲解,不在答案（越具体越好）
When your friends are in trouble,you shonld do all___________them.A.you can help B.you can to help C.that you can helpD.what you can help重在讲解,不在答案（越具体越好）
B,主要在于后面的句子成分
后半句,句子的主干是you should do sth.to help them
all (that) you can (do),是省略了that 和 do的从句
这个我也不确定啊，我也是个学生而已~
不过重点在all,貌似是不能用that还是不能用what
B， do (that) all you can 中，all you can是do 的宾语，that 可省略，to help them 是DO ALL YOU CAN 后面加的不定式！
C 应改为 do that you can to help
D 应改为 what you can do to help
希望能帮到楼主！
B.you can to help
.do all（that）you can“做你所能做的” to help“表目的，（是”为了“帮助他们）
以上是此题要点
选B
翻译：当你的朋友有难时，你应该尽力去帮助他们。
（When your friends are in trouble）是时间状语从句。后面从句还原：...do all （that） you can to help them，其中“that you can”是定语从句修饰“all”。“to help” 表示一种目的，作补语。