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【题目】We will live without hope and future __________ we don’t protect the Earth now.

A. unlessB. afterC. ifD. although

【答案】C

【解析】

句意:如果现在我们不保护地球,我们将会没有希望和未来的生活。A. unless除非;B. after …以后;C. if如果;D. although虽然,尽管。此从句运用了if not结构,表如果不。结合句意。故选C

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