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
When your friends are in trouble,you shonld do all___________them.
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）
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）
英语人气：812 ℃时间：2019-08-20 22:10:34
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