【題目】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：現(xiàn)在我們的注意力都集中在地球環(huán)境何時回歸到正常狀態(tài)�？蘸蠼樵~on的賓語從句，賓語從句又用的是強調(diào)句型。強調(diào)句型特殊疑問句的結(jié)構(gòu)為：特殊疑問詞+ is/was+ it + that +不被強調(diào)的部分。由于題干中的強調(diào)句作賓語從句，應用陳述語序。該句中缺少狀語，也就是缺少被強調(diào)的部分，只有D項符合語境。故選D。

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