The continuous rain the harvesting of the wheat crop by two months.A. set back B. set off

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(答案→)A. set back
B. set off
C. set aside
D. set out
解析：词义辨析。A推迟，拨慢；B出发，使发生，点燃；C放在一边，不管不顾，储蓄；D开始。句意：不断的雨水让小麦的收割推迟了2个月。根据句意说明A正确。