If ____ unsolved, the problem of food safety may lead to more serious results.A.makingB.remainedC.leftD.taking
网友回答
C解析考查省略句。The problem与leave构成被动关系，使用过去分词。完整的结构应该是If the problem is left unsolved, the problem of food safety may lead to more serious results.句意：如果这个问题被留在没有被解决，它会导致更严重的后果。