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题型：单选题题类：真题难易度：普通

—I won't get good grades_______ I study hard.

—That's ______ everyone is trying his best to prepare for the exam.

A、until; why B、unless; when C、unless; why

举一反三

______ you have a talk with him, you will know he is a good person.

-- Do you go by bus ______ by train?

-- Neither, I ride to school.

Going to the movies is good, I really only like listening to music.

Simon, don't stay up too late, you'll be sleepy tomorrow.

—You can come and play with me ______ you're free.

— Thank you. I will.

Many people chose to go out for an outing during the National Day holiday _____ the traffic on highways (公路) was very heavy.

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