【題目】Don’t offer the runners water or any help ______ they ask for it.

A. while B. if C. though D. unless

【答案】D

【解析】

試題分析:句意:除非他們要求,不要提供給跑步者水或任何幫助A. while當……的時候;B. if如果;C. though盡管;D. unless除非。根據(jù)題意。故選D。

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