选c.put out、be out和go out都能表示火被熄灭.这里make sure 后面接的是一个宾语从句,也就是可以把后面的 the fire ---before you leave单独看作一个句子分析.用put out主语是the fire ,必须用被动is put out,排除A、B.D的时态不对,“当你离开时请确保火已经熄灭了".火俨然现在还没熄灭,不能用一般过去时.选c表状态,the fire is out火是灭的.
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make sure the fire ---before you leave Aput out Bbe put out
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