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题目内容
（西安石油大学英语二）
18. (单选题) The sales manager asked his men to inform him __________ everything concerning the sales in time.( )(本题2.5分)
A、 /
B、 of
C、 against
D、 on
A、 /
B、 of
C、 against
D、 on
参考答案