问题
选择题
_______ the Atlantic Ocean crosses the equator, the trade winds cause a flow of water to the west.
A．That
B．When
C．Where
D．Though
答案
C
从句子结构上判断，前一分句属于状语从句，从句子意义上判断，该分句应为地点状语，故答案应为C项。
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