根据n多题专家分析,试题“I was supposed ____ her, but I failed.A.to help B.to have helped C.to be helping D.will help…”主要考查了你对 【虚拟语气】,【情态动词】 等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。
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