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By the time the FDA discovered its illegal production, the tobacco company____ s
By the time the FDA discovered its illegal production, the tobacco company____ s
游客
2025-06-18
28
管理
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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