It advises artists to ________ from smoking or eating while painting, to use face masks and to provide adequate ventilation (通风) by means of an extractor fan. A、refrain B、refuse C、stay D、reject

It advises artists to ________ from smoking or eating while painting, to use face masks and to provide adequate ventilation (通风) by means of an extractor fan.
A、refrain
B、refuse
C、stay
D、reject

出自：华北水利水电大学-大学英语

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