the meeting was concerned （）reforms and everyone present was concerned（）their own interest.
题目
the meeting was concerned （）reforms and everyone present was concerned（）their own interest.
A with ：for B with：with
C for； about D about ；with
应选a 请详细说明下1 11
答案
A be concerned with sth 与某事相关
be concerned for 对某事感兴趣,关心某事或某人
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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