We need to have factual knowledge （） our marketing strategy.

题库:报检员 类型:最佳选择题 时间:2017-07-03 10:55:05 免费下载:《单项选择》Word试卷

We need to have factual knowledge （） our marketing strategy.
A.on which to base
B.which to base upon
C.to which base
D.and based on

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