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Fredisabsentfromthemeeting.Idon'tknowexactlywhenheiscomingbackbutI'msurehe'llbebackMonday.A.onB.byC.untilD.after

题目详情
Fred is absent from the meeting. I don't know exactly when he is coming back but I'm sure he'll be back ________ Monday.
A. on
B. by
C. until
D. after
▼优质解答
答案和解析
答案B
介词by后接表时间的名词,意为“在……之前”如:I have to go back by ten o'clock.我必须在10点钟以前回去.Will you please finish the work by Friday? 请你在星期五之前完成这份工作好吗?