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much() at his son's poor performance at shool,Mr.Green didn'

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much() at his son's poor performance at shool,Mr.Green didn't know how to educate him
A.disappointed B.disappointing C.to be disappointed D.having disappointed
为什么选A,
much() at his son's poor performance at shool,Mr.Green didn'
这是属于非谓语的题目
因为,这里没有连词,因此,只能有一个谓语动词,就是know,那么,其他的动词就要处理成非谓语动词
这里
much() at his son's poor performance at shool
的状语部分,的逻辑主语是mr green,同时,有个系表结构,be disappointed at 的结构,因此,变成非谓语,be 要去掉,以形容词的形式出现,就是disappointed
要注意的是,这里不是表被动的过去分词,因为,你从被动角度,无法理解的
这里是有个介词at,提示你是一个系表结构