Without facts, we can't form a worthwhile opinion, for we need to have factual knowledge ______ our thinking.
| A．which to be based on | B．upon which to base |
| C．which to base upon | D．to which to be based |
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Without facts, we can't form a worthwhile opinion, for we need to have factual knowledge ______ our thinking.
| A．which to be based on | B．upon which to base |
| C．which to base upon | D．to which to be based |
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