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______ we all know, the sun rises in the east and sets in the west.

A. Which
B. What
C. As
D. It
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科目：高中英語 來源：期中題 題型：單選題

______ we all know, the sun rises in the east and sets in the west.
[     ]
A. Which
B. What
C. As
D. It

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