His friends did ____ they could ____him out of difficulty.A.all what; to help B.all; to help

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
英语人气:435 ℃时间:2019-08-18 23:32:03
优质解答
B
定语从句的先行词是all时,引导词用that,排除A
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