--It’s six o’clock and your father is still at the office.--I know. Who else could _______ he does?A.be as hard working asB.be working harder thanC.do harder work thanD.work as hard as
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D解析注意答语中前后动词形式要一致，因空后是he does，故前面应用work作谓语动词；C项的do harder work与对话内容不连贯。