问题
My uncle is a doctor. He sometimes has to work _______ night.
A:in
B:at
C:on
D:For;
B:at
C:on
D:For;
正确答案是：
同类题型
What happened to Mike—He had a stomachache. He began to work _______ having breakfast this morning.
Under no circumstancesto the teacher
They often chatted about the hardtimes______they spent together in the old days.
The born artist devoted all the time he had ______ for something better or different.