单选题
These countries are ______ concluding a free trade agreement to propel regional development.
A. on the verge of
B. in the interest of
C. on the side of
D. at the expense of
A
B
C
D
【正确答案】
A
【答案解析】
on the verge of：在……边缘，很快就……；in the interest of：为了……利益；on the side of：在……一侧；at the expense of：以……为代价，由……负责费用
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