Boys, don’t touch the machine, or you may hurt .A. yourselfB. themselvesC. himselfD. yours

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A. yourself
B. themselves
C. himself
(答案→)D. yourselves
解析：yourself你自己；themselves他们自己；himself 他自己；yourselves你们自己。句意：孩子，不好摸机器，否则会伤害的你自己。结合语境可知选D。