We arrived home at 9:00 in the evening,
题型：选择题
问题：
We arrived home at 9:00 in the evening, ________most people had already had supper.[ ]
A. at that time
B. by that time
C. at which time
D. by which time
题型：选择题
We arrived home at 9:00 in the evening, ________most people had already had supper.[ ]
A. at that time
B. by that time
C. at which time
D. by which time
