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 为什么选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 为什么选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 为什么选D?
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 为什么选D?

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 为什么选D?
我认为选 B 和 D 都可
by that time 和 by which time 都有 "届时" "之前“ 之意.
另一同义词是 by then.
by xxx 表示事情已经发生了.
that 和 which 是代词,用来显示关系,意思是 这(个),那(个) .
如 the house in which I once lived 我从前住过的房子.
但 by which time 是比较习惯用法.