If you sit in a chair _____a long time, your back may begin to hurt.
#50771
A
at
B
in
C
on
D
for
推荐题目
— do you study for tests? —I study listening to tapes.
#47210
A
How; with
B
What; with
C
How; by
D
What; by
If you sit in a chair _____a long time, your back may begin to hurt.
— do you study for tests? —I study listening to tapes.