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题型：单选题题类：模拟题难易度：普通

I'd like to travel by air _________ it usually costs a lot of money.

A、so B、though C、until D、or

举一反三

_______the sun was not yet up, many people were already taking exercise in the square.

The little girl felt upset _______ her pet dog died.

My grandfather still looks very strong and healthy he is 90.

We all like Mr. Zhou ______ he is so kind to us.

I think math is difficult _________ interesting. What do you think of it?

I didn't work out the problem ________ Jack taught me.

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