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题型：单选题题类：真题难易度：普通

Although he's over 70, he is full of energy.

A、but B、and C、so D、/

举一反三

To protect trees, we shouldn't use paper towels ______napkins.

—Excuse me. Do you have a table for two?

—I'm sorry, there aren't any seats now.

_______ it was getting late, I turned around to start for home.

When you're learning English, just use it, ________ you'll lose it.

This project requires close teamwork. Nothing will be achieved we work well together.

Peter is my best friend ______ he comes to visit me each year.

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