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
考察固定結(jié)構(gòu)。Increase to增加到…表示結(jié)果；increase by…增加了…表示程度；結(jié)合句意可知C正確。句意：這家工廠的工人數(shù)量增加到了300，就是說增加了百分之20.
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