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题型：单选题题类：常考题难易度：容易

He realized his mistakes and took action to reduce the loss _________ it was too late.

A、until B、when C、before D、as

举一反三

Hurry up, ________ you will miss the first bus.

-- Hello, Mike!

-- Sorry, I don't think l know you.

— When is she leaving?

—She isn't leaving here__________ Sunday morning .

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

The sky is much bluer we have taken action to protect the environment.

I wonder _________________ you will go with tomorrow.

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