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.it
D.what
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D解析试题分析：考察宾语从句。本题中的宾语从句what is called the Middle East作为介词on的宾语。在宾语从句中what充当的是主语。That不能再宾语从句中做主语，it不能引导宾语从句。Which是指特定范围之内的某一个。句义：随着伊朗的核危机越来越严重，全世界的注意力都集中到被称为中东的地方。故D正确。考点：考察宾语从句