问题描述：
英语单选一道,求解释
It was his nervousness in the interview,i think,_____cost him the job。
a.which b.that c.how d.what
答案是b
求解释
It was his nervousness in the interview,i think,_____cost him the job。
a.which b.that c.how d.what
答案是b
求解释
问题解答：
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