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

試題分析：句意：Rick自從來到中國了解了許多有關中國的文化。A.before“在…之前”；B.when“當…時候”；C.until“直到…時候才”；D.since“自從”。本句時態(tài)是現在完成時，since從句用于現在完成時中。結合語境，故選D。
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