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

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Hecamebacklate,___whichtimealltheguestshadalreadyleft.A.afterB.byC.atD.duringHecamebacklate,___which

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

He came back late,___which time all the guests had already left.A.after B.by C.at D.during
B
首先,从语义上分析,客人们肯定在john回来之前已经离开,之前是by the time
而且,had left是过去完成时,which引导定语从句,which指代john回来那个时候,提示过去时间同时也是过去完成时的标志词组的也是by the time

B.
all guests had already left by that time , 在重句中该成了which

C at

答案选B.by

B