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Rick has learned a lot about Chinese culture _____ he came to China.
A.before B.whenC.untilD.since
D

试题分析:句意:Rick自从来到中国了解了许多有关中国的文化。A.before“在…之前”;B.when“当…时候”;C.until“直到…时候才”;D.since“自从”。本句时态是现在完成时,since从句用于现在完成时中。结合语境,故选D。
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