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【題目】Unless everyone ________ actions to stop pollution, the environment problem may become worse.

A. take B. takes C. took D. will take

【答案】B

【解析】句意：除非每個人采取行動阻止污染，環(huán)境問題可能更糟糕。Unless引導的條件狀語從句用一般現在時表示一般將來時，故選B。

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