题目

—You could have asked Mr Johnson for help. He is kind-hearted. —I ________ that. A whole day ________. A. forget; wastes     B. forgot; was wasted     C. forgot; had wasted      D. forget; was wasted 答案：B 解析: 说话之前“忘了”，故用一般过去时态；第二空应用一般过去时的被动语态形式。 已知函数，则的最小值为 A．          B．        C．          D．