题干
In the past, jeans were just hard-wearing pants workers.
A：is designed by
B：designed for
C：is designed for
D：designing for
答案(点此获取答案解析）
B
In the past, jeans were just hard-wearing pants workers.
A：is designed by
B：designed for
C：is designed for
D：designing for
A=600,
=
,
,则B等于 （ ）