PREP中的1道DS,求分析

bettytons

Is the measure of one of the interior angles of duadrilateral ABCD equal to 60 degree?
(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.

我觉得选C.
但是答案E.
什么也想不明白了.

initusur

(90,90,135,45)或（90，90，120，60）

yichaoe

可能是90 90 45 135

bettytons

受教了.多谢多谢 ~