这题选B对么,若不对,请说明理由32.________ for years,life on other planets is still a mystery for human beings.A.Having been looked for B.Having been looking forC.Having looked for D.Looked for
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![这题选B对么,若不对,请说明理由32.________ for years,life on other planets is still a mystery for human beings.A.Having been looked for B.Having been looking forC.Having looked for D.Looked for](/uploads/image/z/4115340-36-0.jpg?t=%E8%BF%99%E9%A2%98%E9%80%89B%E5%AF%B9%E4%B9%88%2C%E8%8B%A5%E4%B8%8D%E5%AF%B9%2C%E8%AF%B7%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B132.________+for+years%2Clife+on+other+planets+is+still+a+mystery+for+human+beings.A.Having+been+looked+for+B.Having+been+looking+forC.Having+looked+for+D.Looked+for)
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