His grandfather is old.He is still working hard for our country(合并为一句）
问题描述：
His grandfather is old.He is still working hard for our country(合并为一句）
____his grandfather is old,____he is still working hard for our country
答
Although(Though)_his grandfather is old,he is still working hard for our country第二空千万别用but,因为but 是并列连词,而这是主从复合句.或者：His grandfather is old,_but_he is still working hard for our...那第二空填什么如果前一空填了 Although , 第二空不填了（复合句）， 如果要填，可填 yet, 或者 still. 可我仔细一看，第二句已经有了个still 了。 所以第二空就不要填了。如果第一空不填， 第二空就必须填 but (并列句） 仔细看我的解释。