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    【题目】Now all of our concentration is on ________ it is that the global environment will return to normal.

    A. whichB. whatC. where D. when

    【答案】D

    【解析】句意：现在我们的注意力都集中在地球环境何时回归到正常状态。空后介词on的宾语从句，宾语从句又用的是强调句型。强调句型特殊疑问句的结构为：特殊疑问词+ is/was+ it + that +不被强调的部分。由于题干中的强调句作宾语从句，应用陈述语序。该句中缺少状语，也就是缺少被强调的部分，只有D项符合语境。故选D。

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