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22 Jun 02:27 AM

  • Simplified Chinese (China)
Question about English (US)

"We cannot form a sound opinion without facts, for we need to have factual knowledge upon which to base our thinking."

Why to use "upon which to base our thinking" instead of "upon which bases our thinking"? What's the difference between them?

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  • English (US)

  • Simplified Chinese (China)

  • English (US)

  • Simplified Chinese (China)

  • English (US)
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