问题补充：
It took several hundred years paper-making spread to western countries.
A. when
B. before
C. after
D. since
答案：
A. when
(答案→)B. before
C. after
D. since
解析：连词辨析。 A．当……时 B．在……之前 C．在……之后 D自从……。
句意：造纸术花了几百年才传到西方国家。意思是在造纸术完全传到西方之前用了几百年的时间，故选B。
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