单选题：It's difficult for any of us to eat better, exercise more, ..

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It's difficult for any of us to eat better, exercise more, and sleep enough,_____we know we should. A. because B. even if C. as if D. unless

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短文改错。I like watching birds. I choose this hobby years ..

短文改错。I like watching birds. I choose this hobby years ago because I like birds and enjoy being close to the nature. Bird watching is a good hobby so it isn't very expensive. As a beginner, all you need is curiosity and a notebook. When you become c

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You will be successful in the interview _____ you have confi..

You will be successful in the interview _____ you have confidence.A. beforeB. onceC. until D. though

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–Are you available at 3 tomorrow afternoon?

–Are you available at 3 tomorrow afternoon? --Sorry, I ________ a meeting at that time.A．am havingB．will be havingC．will haveD．have

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If you want somebody to go window shopping with you, why no..

If you want somebody to go window shopping with you, why not try calling Marie? —she ________ be home by now.A．shallB．shouldC．willD．would

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We'd better set off now, or it will be dark _____we know it..

We'd better set off now, or it will be dark _____we know it.A. until B. after C. when D. before

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