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题型：单选题题类：模拟题难易度：普通

Someone called me up in the middle of the night, but they hung up I could answer the phone.

A、as B、since C、until D、before

举一反三

–What is your sister going to be ________ she grows up?
–She is going to be an engineer.

It has been three years since I ______ a teacher.

— Did you have a good time during the trip?

— No, we all got wet ________ the bad weather.

—I fell sick!

—I think it is _______ you are doing too much.

—Lucy, you can't use the phone ________ we are far from the gas (天然气) station.

—OK, I won't do that again.

Jack's mother was so tired. She felt asleep ______ she lay down on the bed.

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