Jane was dressed in brown________Mary was dressed in blue

题目

Jane was dressed in brown________Mary was dressed in blue
a.as
b.when
c.while
d.or
请问a错哪里了

答案

a.as
conj.因为；随着；虽然；依照；当…时
b.when
conj.考虑到；既然；当…时
c.while
conj.然而；
d.or
conj.或,或者；还是
这里选c.while
因为前面后有对比,比较