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關閉窗口 五、unless 引導的狀語從句
unless 的意思是“如果不……”“除非”，對于涉及 unless 的考題，一般只要能讀懂句意，弄清語境，一般不會有問題。如：
1. Most birds find it safe to sleep in the trees, but _________ they have eggs or young chicks, they don’t use a nest. (湖南卷)
A. why B. how C. unless D. where
2. I won’t call you, _________ something unexpected happens. (全國I)
A. unless B. whether C. because D. while
【解析】兩道題都選unless，均表示“除非”。
六、until 引導的狀語從句
until 的意思是“直到……時”“在……之前”，對于涉及 until 的考題，一般只要能讀懂句意，弄清語境，一般不會有問題。如：
It is difficult for us to learn a lesson in life ____A____ we’ve actually had that lesson. (天津卷)
A. until B. after C. since D. when
另外，還要注意not…until…這一句式（直到……才）。如：
“You can’t have this football back ____D____ you promise not to kick it at my cat again,” the old man said firmly. (廣東卷)
A. because B. since C. when D. until
七、once引導的狀語從句
once的意思是“一旦”，對于涉及once的考題，一般只要能讀懂句意，弄清語境，一般不會有問題。如：
1. You will be successful in the interview _________ you have confidence. (福建卷)
A. before B. once C. until D. though
2. _________ environmental damage is done, it takes many years for the ecosystem (生態系統) to recover. (江蘇卷)
A. Even if B. If only C. While D. Once
【解析】兩道題都選 once，均表示“一旦”。
八、where引導的狀語從句
where可以用于引導地點狀語從句，其意為“在……的地方”，此用法許多同學都不是熟悉，但高考經常考查，應引起特別注意。如：
1. If you are traveling _________ the customs are really foreign to your own, please do as the Romans do. (天津卷)
A. in which B. what C. when D. where
2. —Mom, what did your doctor say?
—He advised me to live _________ the air is fresher. (四川卷)
A. in where B. in which C. the place where D. where
【解析】兩道題都選 where，均表示“在……的地方”。
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