21. After the new technique was introduced, the factory produced ______ cars in 2009 as the year before.
| A．as twice many | B．twice as many | C．as many twice | D．twice many as |
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21. After the new technique was introduced, the factory produced ______ cars in 2009 as the year before.
| A．as twice many | B．twice as many | C．as many twice | D．twice many as |
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