If you sit in a chair _____ a long time, your back may begin to hurt. [ ]A. at B. in C. on D. for -九
[ ]
题目简介
If you sit in a chair _____ a long time, your back may begin to hurt. [ ]A. at B. in C. on D. for -九
题目详情
[ ]
B. in
C. on
D. for
答案