Doing eye exercises         well in         our eyes. 
A．work; protectingB．works; protectingC．works ; protectD．work; to protect
B

試題分析：做眼保健操對(duì)我們的眼睛有好處。結(jié)合語(yǔ)境可知本句描述的是是客觀性的動(dòng)作，故用一般現(xiàn)在時(shí)態(tài)。主語(yǔ)Doing eye exercises表示抽象含義，故謂語(yǔ)動(dòng)詞用單數(shù)。下文中in是介詞，后面接名詞或者動(dòng)名詞作賓語(yǔ)，故選B。
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