After seemed an endless effort, the patient was finally able to carry out seemed a perfe

After seemed an endless effort, the patient was finally able to carry out seemed a perfectly normal walk.
A. what ; what
B. that；that
C. which；which
D. it；it

(答案→)A. what ; whatB. that；thatC. which；whichD. it；it解析：试题分析:考查名词性从句。分析结构可知After后是宾语从句，从句中缺少主语，而that 在宾语从句中不做成分，所以排除B选项。根据词的用法可知除介词except，but和in以外，其他介词后不可用陈述句做宾语从句，故排除D选项。而what和which的区别是：which侧重范围内的选择，what侧重内容，所以正确答案是A。

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