____yesterday morning they flew to Beijing for a trip.A.in B.on C.at D.不填

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____yesterday morning they flew to Beijing for a trip.A.in B.on C.at D.不填

D
Yesterday morning they flew to Beijing for a trip.
Yesterday morning 时间状语 ,不用加介词,也可以放在句后,昨天上午.翻译:他们昨天上午飞去了北京度假.

D 明天早上,昨天早上之类的时间,都不加介词

d

D、