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引起牙体楔状缺损的主要原因是A.牙体材料疲劳B.牙周病C.牙颈.....
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My wife is out of work now, so we have to ________ our living expenses...
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在SQL的CREATE TABLE语句中,为属性说明取值范围(约束)的.....
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So many representatives________, the conference had to be postponed...
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4 words marked A), B), C) and D ) in each grou.....
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Please speak loudly ________ everyone in the classroom can hear you...
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