【題目】______ the price of food and oil hit the headline, perhaps we should be worried more about water.

A.UnlessB.WhileC.AsD.If

【答案】B

【解析】

考查連接詞。句意：當(dāng)食品和石油價格成為頭條新聞時，也許我們應(yīng)該更擔(dān)心水。A. Unless除非；B. While當(dāng)……時候；C. As因為；D. If如果。根據(jù)句意可知本句為時間狀語從句，表示“當(dāng)……時候”，故選B。

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