单选题____AonBinCatDfor
单选题
____
A
on
B
in
C
at
D
for
参考解析
解析：
本题中所给出的四个选项都是介词，所填介词后面接的是一个数字，C项“at”有“接近，达到”之意，也符合文章前后所要表达的意思。故C项为正确答案。
本题中所给出的四个选项都是介词，所填介词后面接的是一个数字，C项“at”有“接近，达到”之意，也符合文章前后所要表达的意思。故C项为正确答案。
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