题目

The crossing was blocked by many trucks and buses,           made it impossible for us to go to work on time.      A.where      B.what      C.whick      D.that 答案:C 解析: 略某二次函数的图象与x轴的交点坐标为(-1,0),(2,0),则该图象的顶点可能在( )A.第一或第二象限B.第一或第四象限C.第三或第四象限D.第二或第三象限
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