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(guān)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(xiàn)在完成時,since從句用于現(xiàn)在完成時中。結(jié)合語境,故選D。
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