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题型：单选题题类：常考题难易度：普通

You can watch TV ______, but you can't watch it ______ a long time.

A、one, at B、one, for C、first, for D、first, at

举一反三

The first female astronaut went into space in Shenzhou 9 2012.

________ the age of 13, the boy played basketball for his school team.

I like to walk ________ the river bank after supper.

Let's meet at school 1:00 p.m. this afternoon.

There is a river _______ the house _______ the road.

—Who would you like to buy the coat ________?

— I'd like to give it to my brother ________ a present.

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