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1．________ an hour every day has made a considerable difference to my health. A．Having walked B．Walk C．Walking D．Walked 解析：选C。句意： 每天步行一小时对我的健康很有益。此处为动名词短语作主语阐述的是一个事实故选C项。Today we have too many choices of communication through advanced technology，but we seem ________ the joy of communicating face to face. A．losing B．to be losing C．to be lost D．having lost 3．Nobody but doctors or nurses and those ________ by Dr.Li ________ to enter the patient’s room. A．being invited；allowed；are allowed；is allowed；are allowed解析：选C。考查非谓语动词和主谓一致。第一空为过去分词短语作定语；第二空主语的中心词是nobody所以选C项。________ often enough. A．explaining B．to explain C．explain D．explained 解析：选D。考查“have sth.done”结构。句意：到现在为止你应该懂得交通法规了。已经给你解释好多次了。________in a nearby town，the house seems pretty empty most of the time. A．work B．to work C．working D．worked | 
