[題目] 挑戰新多益閱讀滿分(寂天) p.71

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書名：挑戰新多益閱讀滿分
版本：2011 年八月初版再刷
頁數：p.71 142題
題目：

I have sound knowledge _____ credit policies and collection procedures to
control accounts receivable and loss reduction, while reatining good customer
relations and business.
        (A)     of
        (B)     among
        (C)     across
        (D)     toward










疑問：為甚麼是A不是C

看完答案後覺得兩個好像都可以 不太會分怎麼用

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