题目

Both my father and my mother _______ playing tennis when they were young. A. like              B. likes         C. liked          D. to like 答案:C   由时间状语when they were young可知此处应用一般过去时,故主句中的谓语动词应    用like的过去式liked。英国科学家法拉第经过10年不懈的努力,发现了电磁感应现象.图所示的四个实验中,表示这一重大发现的是(  )A.B.C.D.
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