Question

He came back late, _____ which time all the guesses had already left. A．by B．at C．during

He came back late, _____ which time all the guesses had already left. A．by B．at C．during D．after

Answer 1

A

介词辨析.在表示时间时,by在……之前；at表示在具体时刻；during表示在……期间；after表示在……之后。句意：他回来晚了，在那之前客人们已经离开了。选A。