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）
人气：339 ℃ 时间：2019-08-20 22:10:34
解答
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
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