五、unless引导的状语从句

unless的意思是“如果不……”“除非”，对于涉及unless的考题，一般只要能读懂句意，弄清语境，一般不会有问题。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. (全国I)

A. unless B. whether C. because D. while

【解析】两道题都选unless，均表示“除非”。

六、until引导的状语从句

until的意思是“直到……时”“在……之前”，对于涉及until的考题，一般只要能读懂句意，弄清语境，一般不会有问题。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，还要注意not…until…这一句式(直到……才)。如：江苏高考网

“You can’t have this football back ___D___ you promise not to kick it at my cat again,” the old man said firmly. (广东卷)

A. because B. since C. when D. until

七、once引导的状语从句

once的意思是“一旦”，对于涉及once的考题，一般只要能读懂句意，弄清语境，一般不会有问题。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 (生态系统) to recover. (江苏卷)

A. Even if B. If only C. While D. Once

【解析】两道题都选once，均表示“一旦”。

八、where引导的状语从句

where可以用于引导地点状语从句，其意为“在……的地方”，此用法许多同学都不是熟悉，但高考经常考查，应引起特别注意。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】两道题都选where，均表示“在……的地方”。

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