491. Dad, can I surf the Internet?
Again?I wish you __ going online ______ your health.
A.know；will do harm to
B.knew;is doing harm to
C.know；have done harm to
D.knew;were doing harm to
492.The stone under her feet rolled，and as she was ______ into the river,she called out for help.
A.being jumped
B.jumped
C.pulling
D.being pulled
491.答案是B;第一空wish+从句应用虚拟语气，与现在或将来事实相反，从句动词用过去式；第二空陈述事实，故用现在时。此题B选项也可用does harm to来代替。
492.答案是D;as引导的时间状语从句通常用进行时，此处表示她是被拖下水。
