求解一道DS题，谢谢！

youngerlee

Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?
(1)    Two of the interior angles of ABCD are right angles.
(2)     The degree measure of angle ABC is twice the degree measure of angle BCD.

答案是C，但我觉得是E啊

youngerlee

thanks @

taohuaxian

90 90 60 120
90 90 45 135

都可能出现邻角二倍关系

应该是E