【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(dāng)……的時(shí)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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