formaworthwhileopinionforweneedtohavefactualknowledge___our...
Thissentenceisfromanexercisebook.Thewholesentenceis:
Withoutfacts,wecannotformaworthwhileopinionforweneedtohavefactualknowledge___ourthinking.
Thecorrectansweroftheblankis:onwhichtobase
Theredcolourpartmakemeconfused.
Ihopesomebodycouldbetellingmethestructureofthesentence.Ican'tfullyunderstandsuchsentences.
请帮我理解从空处开始向後的这个部分
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