问题
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
答案
答案：D
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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
答案：D