求解释一道SAT语法题:

求解释一道SAT语法题:

题目
求解释一道SAT语法题:
Many alcoholics attempt to conceal their problem from their fellow workers,( but invariablyfailing to keep their secret.)
A.but invariablyfailing to keep their secret.
B.but they invariably fail to keep their secret.
D.who invariably fail to keep their secret.
答案
平行结构.sd do ,but do D.指代错误
举一反三
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奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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