Rick has learned a lot about Chinese culture he came to China.A．before B．when C．until D．since 题目和参考答案——青夏教育精英家教网—

Rick has learned a lot about Chinese culture _____ he came to China.

A．before

B．when

C．until

D．since

解析试题分析：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。
考点：考查连词的辨析。

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