With the nuclear crisis worsening in Iran, the world's attention is fixed again on is called the Middle East．
A. which
B. that
C. what
D. it
网友回答
A. which
B. that
(答案→)C. what
D. it
解析：考查宾语从句。What is called the Middle East作为on的宾语。What引导起这个宾语从句并且在句中做主语。句意：随着核危机越来越严重，全世界的注意力又一次被集中到这个被称为中东的地区。