As a beginner in English, we should acquire as much knowledge as possible, _____ our communication skills.

A. which are based
B. upon which are based
C. which are based upon
D. to which are based
B
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科目：高中英語 來源：0119 期中題 題型：單選題

As a beginner in English, we should acquire as much knowledge as possible, _____ our communication skills.
[     ]
A. which are based
B. upon which are based
C. which are based upon
D. to which are based

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