请选择ABC6D6c9W9C刘师傅现在与过去工作效率的比是_________(k4T2^9?;]'c,Q2w,w5\-b(j,d
A.3∶3(k4T2^9?;]'c,Q2w,w5\-b(j,d
B.1∶3(k4T2^9?;]'c,Q2w,w5\-b(j,d
C.3∶1(k4T2^9?;]'c,Q2w,w5\-b(j,d