He came back later, ________which time they had left.A、afterB、byC、fromD、forB

游客2025-04-28 20

问题 He came back later, ________which time they had left.

选项 A、after
B、by
C、from
D、for

答案 B

解析 by与时间搭配表示时间的限时。本句相当于"By the time he came back later，they had left”。

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