题目信息
The spokeswoman for the national laboratory announced that, while the lab had been operating at a loss in the 1990s, it had become profitable in 2006, and would continue to yield high profits at least until 2025.
A:had been operating at a loss in the 1990s, it had become profitable in 2006, and would continue
B:had been operating at a loss in the 1990s, although becoming profitable in 2006, and will continue
C:had been operating at a loss in the 1990s, it became profitable in 2006, continuing
D:operated at a loss in the 1990s, becoming profitable in 2006, then would continue
E:operated at a loss in the 1990s, becoming profitable in 2006, and continuing
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A:had been operating at a loss in the 1990s, it had become profitable in 2006, and would continue
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