His friends did ____ they could ____him out of difficulty.A.all what; to help B.all; to helpsame rule,please give your answer and explain why.thanks :D
问题描述：
His friends did ____ they could ____him out of difficulty.A.all what; to help B.all; to help
same rule,please give your answer and explain why.thanks :D
答
B他爸做了他能做的去帮他建个实验室. did 后面少了宾语，WHAT HE COULD 可以做为一个短语做宾语 选B； 意思是尽自己所能。他爸爸尽自己所能为
答
B
did all (that) they could to do something
你问我为什么？固定搭配，不知道啊，反正是这样用的
答
B
定语从句的先行词是all时,引导词用that,排除A
答
all to help