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题型：单选题题类：模拟题难易度：普通

Don't promise anything ________ you are one hundred percent sure.

A、if B、after C、when D、unless

举一反三

Jack usually goes to school by bike, ________ today he walked to school.

—Will you please give the dictionary to Jane?

—Sure． I'll give it to her ________ she arrives here．

________ you know little about this art form, you can find a book to learn more.

If he the early bus, he there on time.

_______ we work at English, the better grades we will get.

—Would you like to drink tea coffee?

—Tea, please.

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