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试题详情及答案解析
He was knocked down by a car ____ he saw it run toward him.
A.beforeB.afterC.whenD.till
答案:A
试题分析:考查连词。句意:在他看到车冲向他之前 ,被这辆车撞倒,根据句意选A项。
考点 :   考查连词