______ almost all our time to our schoolwork in the past three months, we have almost no time for fun and play．A.Having devotedB.DevotedC.To devoteD.To have been devoted
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A解析考查非谓语动词。devote表示“投身于，致力于”，用devote oneself/one’s time to或be devoted to，本空接了宾语，有延续性时间状语，因此用现在分词完成式做状语。