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(2013·安徽省芜湖三校一模)A recent study has found that the number of smokers ________ sharply over the past five years.

A.is increasing: H, J" H7 @: P' `) f
B.are increasing* _ ], f2 J' A- H7 `
C.has been increasing
3 f! L8 R8 g; ]. h# P, @
D.have been increasing7 f" [+ M7 P5 g# ?

答案C

解析