I didn’t have to work all weekend — I did it by _______A.chanceB.choiceC.accidentD.myself
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B解析由于上文说 didn’t have to work，所以下文相应的语境应是 did it by choice。类似地，下面一题应选D，也是因为choice与下文的have to do it 相呼应：Were you given a _____, or did you have to do it? A. job B. dutyC. request D. choice