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题型：单选题题类：真题难易度：容易

I love the air it rains because it smells fresh.

A、since B、after C、before D、whenever

举一反三

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

You should keep working hard ________ you have passed the exam.

Remember to return the book to the school library in time, _______ you will be fined (罚款).

—Does Ted tell you ______ he will come next week?

—No, he doesn't. But if he comes, I'll give you a ring.

I hate traveling by air ____ I usually have to wait for hours before the plane takes off.

Though too much homework may make us students bored, ________ it's really necessary for us. Therefore, we should finish it as carefully as possible.

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