单项选择题
I have spent a lot of time（）working on this problem.
A.at
B.–（不填）
C.on
D.with
点击查看答案&解析
相关考题
-
单项选择题
She likes to spend time（）with her grandchildren.
A.play
B.to play
C.playing
D.played -
单项选择题
China is（）the east of Asia.
A.in
B.to
C.on
D.at -
单项选择题
That place is（）the south of the city.
A.at
B.in
C.on
D.to
