---Dad, can I surf the Internet?---Again? I wish that you ______ going on line ______ your health.A.know; will do harm toB.knew; are doing harm toC.know; have done harm toD.knew; were doing harm to
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B解析考察虚拟语气在非虚拟句中的运用和动词时态。第一空白处：在wish的宾语从句中，谓语动词如果表达与现在事实相反要用过去式，第二空白处上网太多有害身体健康是生活常识，应用一般现在时。