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题型：单选题题类：模拟题难易度：普通

You will achieve nothing ________ you work hard.

A、if B、unless C、when D、that

举一反三

— Tom wants to know if you will have a picnic tomorrow.
— Yes, but if it_______, we'll play chess instead.

A tourist will easily lose his way in shanghai ________ he has a map or a guide.

—would you please give this MP3 to Mary?

—Sure. I'll give it to her ____ she comes back.

—Let's go climbing Langshan Mountain this Saturday ______the weather is fine.

—Good idea!

Sandy wants to buy the same sports shoes ________ the star did.

I have to study too much _______________ I don't get enough sleep.

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