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：考查名词性从句。介词on后跟从句作宾语，即宾语从句。宾语从句“ is called the Middle East.”缺少主语，which“哪一个”；that在宾语从句中不作成分；it不引导宾语从句。故选C。