The commodity enjoyed exemptions from custom duties prior to 199

The commodity enjoyed exemptions from custom duties prior to 1999.
A、at last
B、after
C、before
D、from
【正确答案】：C
【题目解析】：句意:商品在 1999年之前可享受关税免除权。prior to意为“在....之前”。选项中at last 意为“最后”;after 意为“在...之后”;before意为“....之前”;from意为“自...从...”。故本题选C。