问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A