Question

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

A．before

B．when

C．until

D．since

Answer 1

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。