After the new technique was introduced，the factory produced ___ tractors in 1988 as the year before.
| A．as twice many | B．as many twice | C．twice as many | D．twice many as |
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After the new technique was introduced，the factory produced ___ tractors in 1988 as the year before.
| A．as twice many | B．as many twice | C．twice as many | D．twice many as |
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