题干
I used to _____ to work. To keep healthy, I am used to ______ to work now.
A：drive； walking
B：driving； walking
C：drive； walk
D：driving； walk
答案(点此获取答案解析）
A
I used to _____ to work. To keep healthy, I am used to ______ to work now.
A：drive； walking
B：driving； walking
C：drive； walk
D：driving； walk
(cosβ－cosα)且α∈(0，π)，β∈(0，π)，则α－β等于( )
