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

问题补充：

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：

(答案→)A. what ; what

B. that；that

C. which；which

D. 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。