【黑龙江省哈尔滨市2015年中考英语试题】 Doing eye exercises one of the useful ways to protect our eyes.
A. is B. are C. were
【黑龙江省哈尔滨市2015年中考英语试题】 Doing eye exercises one of the useful ways to protect our eyes.
A. is B. are C. were