问题描述：
完形填空的一空
I am so ___of my son as he had to really work hard to get into the Air Force.
答案是proud 不能选afraid
why?afraid不是有担心的意思么?
I am so ___of my son as he had to really work hard to get into the Air Force.
答案是proud 不能选afraid
why?afraid不是有担心的意思么?
问题解答：
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