题干
—What time do you usually go to bed? —I usually go to bed _________ eight o'clock.
A：in
B：on
C：at
D：/
答案(点此获取答案解析）
C
—What time do you usually go to bed? —I usually go to bed _________ eight o'clock.
A：in
B：on
C：at
D：/
