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问题: 选介词

Next week we will have a test _________math.
A. on B. in C. at D. for

解答:

Next week we will have a test _________math.
A. on B. in C. at D. for
答案:A.on
解析:on表示哪方面,关于
a test on 指一次某门功课的考试。