31、Dogs, if _____ properly, can assist the police in many ways.
A. training B. trained C. being trained D. to be trained
31、B
科目:高中英語(yǔ) 來(lái)源: 題型:
Dogs, if _____ properly, can assist the police in many ways.
A. training B. trained C. being trained D. to be trained
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