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It took several hundred years ______ paper-making spread to western countries.

A．when

B．before

C．after

D．since

連詞辨析。 A．當……時 B．在……之前 C．在……之后 D自從……。
句意：造紙術花了幾百年才傳到西方國家。意思是在造紙術完全傳到西方之前用了幾百年的時間，故選B。

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