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题型：单选题题类：常考题难易度：普通

Mr. Green works in office, but his sister works a farm.

A、a, in B、an, in C、an, on

举一反三

The nature reserve is a good place _______ wild animals ____ live ___.

I didn't know who ran to the finishing line first. They seemed to arrive there ______ the same time.

I can write my homework________ the computer.

—Which would you prefer, orange juice or coffee?

—Either OK, but I prefer coffee milk.

That is eraser and eraser is white.

You'd better that leather coat. It doesn't look modern you at all.

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