题目

点O为直线l上一点，射线OA，OB均与直线l重合，将射线OB绕点O逆时针旋转α（0≤α≤90°），过点O作射线OC，OD，OM，ON，使得∠BOC=90°，∠COD=2α，∠COM= ∠AOC，∠CON= COD（OM在∠AOC内部，ON在∠COD内部），当∠MON= α时，则α= 答案：【1】20°In fact the Swede did not understand the three questions ______were asked in French. A. where    B. who   C. in which  D.  which