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题型：单选题题类：真题难易度：普通

Rick has learned a lot about Chinese culture _____ he came to China.

A、before B、when C、until D、since

举一反三

—Doctor, I've got a headache. —Don't worry, Just take some medicine, you'll be OK again.

I like making friends, I am a little quiet.

Don't move the desk your teacher allows you.

She is good at playing football _______ singing songs.

He was having supper _____ his father came back home.

Jenny didn't go to bed her mother came home last night.

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