【題目】The volunteers kept their hands in hot water __________ they could no longer tolerate the pain.

A. unless B. until

C. when D. after

【答案】B

【解析】A.unless除非；B.until直到；C.when 什么時(shí)候；D. After在…后；句意：志愿者們把他們的手放在熱水直到他們不再忍受疼痛。故選B。

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