His parents were angry____what he did.A.because B.with C.because of
问题描述：
His parents were angry____what he did.A.because B.with C.because of
答
应该是 at 表原因
be angry at sth 因…而愤怒:
The members of the group are frustrated and angry at their lack of power.
该集体的成员因为没什么权力而感到沮丧和愤怒.
比较：
be angry with sb生（某人）的气:
I got terribly angry with him.
我对他非常恼火.
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