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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

Diana isn't here, leave a message on her desk.

It's almost eight years we saw each other last time．

I wonder when they ________ for Beijing. I will go to the train station to see them off when they ________.

— Which do you prefer, tea _______ coffee?

— Tea, please.

Taxi apps(打车软件) can help us travel around more easily. ____________ more and more people like using them.

You won't get paid for time off you have a doctor's note.

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