Population in that area has increased ________ 10 percent this year.

Population in that area has increased ________ 10 percent this year.

A.with

B.for

C.by

D.of

答案及解析： C

by表示增加的程度，另外increase也可以加to，表示增加后的最终结果，它的反义词reduce也有此类用法。