问题
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In the past few years, traffic problems (become) ________ more and more serious.
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Now scientists have found in the past few years ______.A.the exposure of DNA to the public
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In the past few years, it has been a trend for Chinese universities to build new campuses,
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If only I______hard in the past few months! But I didnt work hard enough and failed the ma
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AIDS is said() have been the biggest health challenge to both men and women in that area over the past few years.
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Working hours in the United States ____________over the past 20 years.A. have increased
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