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The number of  the workers in this factory     300, that is to say,
it       20%.
A.has increased by; has increased to
B.have increased to; have increased by
C.has increased to; has increased by
D.have increased by; have increased to
C
考察固定结构。Increase to增加到…表示结果;increase by…增加了…表示程度;结合句意可知C正确。句意:这家工厂的工人数量增加到了300,就是说增加了百分之20.
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