【題目】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:通常當我們意識到大自然對我們有多重要性時已為時已晚。A. until直到……才;B. unless除非;C. before在……之前;D. after在……之后。not…until…直到……才,結(jié)合句意“直到太晚了我們才意識到大自然對我們的重要性”故答案為A。

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