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There is always the ____of an earthquake in this region, but so far there has been no sign
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A considerable amount of time and money has been invested in ______ this system.A．defining
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Mary says this is the______ decision she has ever made in her career life.A．badB．worstC．wo
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In______, Chinatown has been the center of its Chinese community since the 1850s, which is
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Mary looks unhappy because she has ______ by her classmates.A、laughedB、laughed atC、been
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This book has been in the works so long that I have lost ______ of most of the sources fou
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The company has been producing this model of machine tool ___________ 2008.
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