By the time the FDA discovered its illegal production, the tobacco company____ s

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问题 By the time the FDA discovered its illegal production, the tobacco company____ several years to develop new narcotic tobacco products.

选项 A、are spending
B、will have spent
C、spend
D、had spent

答案 D

解析因为是比过去发生的事情discovered更早的事情，所以应该选择过去完成时had spent。

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