Yao Ming has bee a superstar in the States, but several years ago no one could have imagined the role on the basketball playground he ________.A.has playedB.playedC.was to playD.plays
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C解析句意：姚明已经成为了美国篮球明星，但是几年前没有人能够想象他会在篮球场上发挥如此重要的作用。时间状语several years ago提示此处指的是过去时间，故排除A和D。几年前没人能够想象将来姚明会发挥的作用，因此用was to do表示过去将来。