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【题目】Usually we don’t realize how important nature is to us ________ it is too late.

A. until B. unless C. before D. after

【答案】A

【解析】

句意:通常当我们意识到大自然对我们有多重要性时已为时已晚。A. until直到……才;B. unless除非;C. before在……之前;D. after在……之后。not…until…直到……才,结合句意“直到太晚了我们才意识到大自然对我们的重要性”故答案为A。

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