2.某校春季运动会比赛中,七年级六班和七班的实力相当,关于比赛结果,甲同学说:六班与七班的得分比为4:3,乙同学说:六班比七班的得分2倍少40分,若设六班得x分,七班得y分,则根据题意可列方程组( )
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| A. | $\left\{\begin{array}{l}{4x=3y}\\{x=2y-40}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{4x=3y}\\{x=2y+40}\end{array}\right.$ | C. | $\left\{\begin{array}{l}{3x=4y}\\{x=2y+40}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{3x=4y}\\{x=2y-40}\end{array}\right.$ |