---Do you know what Tom does all day ?---I know he spends at least as much time watching TV as he _______his lessons.A.is doingB.doesC.spends to doD.does doing
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D解析本题考查状语从句。题中does doing his lessons中的does相当于spends much time; 选项C spends 是个及物动词，因其后面无宾语，故不用。选D。