【題目】I enjoy fresh air so I always let the window open ________ it is really cold.

A．unless B．when C．if D．since

【答案】A．

【解析】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。“天冷”是“讓窗戶開著”的否定條件，故unless“除非”符合題意。

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