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题型：单选题题类：模拟题难易度：普通

In America, a friend inviting you to a restaurant doesn't mean that he or she will pay for the meal ______ you are told ahead.

A、until B、unless C、although D、if

举一反三

— Would you like to lend me some money?
— I'd love to, _______ I left my purse at home.

_______ did they watch the 2012 London Oylmpic Games, _______ I watched it.

—How difficult physics is! I really want to drop(放弃) it !

— you come on, you will do it better.

Ken is very generous. _______, he is skillful in playing chess.

If Mr Green is free tomorrow, he{#blank#}1{#/blank#}(come) to your birthday party.

Think of a number, _______don't tell me what it is.

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