Question

—Dad, can I surf the Internet?
—Again? I wish that you ______ going on line ______ your health.

1. A.
   know; will do harm to
2. B.
   knew; are doing harm to
3. C.
   know; have done harm to
4. D.
   knew; were doing harm to

Answer 1

B
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。