One evening when it was so warm, I stayed awake until half past eleven in order to have a

One evening when it was so warm, I stayed awake until half past eleven in order to have a good look at the moon by myself.
A. on average
B. on purpose
C. on sale
D. on schedule

A. on average(答案→)B. on purposeC. on saleD. on schedule解析：句意，一天傍晚，天气很暖和，直到十一点半我都没有睡觉，为了亲自看一下月亮。on average平均起来on purpose故意地on sale有售on schedule按时间表，根据题意，故选B。

这个答案应该是对的

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