【題目】I enjoy fresh air so always sleep with the window open ______ it is really cold．

A．unless B．when C．if D．Since

【答案】A

【解析】

試題分析：A．Unless除非，如果不；B．When當(dāng)……的時(shí)候；C．If如果；D．Since自從。句意：“我喜歡新鮮空氣，因此我總是讓窗戶開著，除非真的很冷。”故unless“除非”符合題意。根據(jù)題意可知選A。

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