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语法A great number of colleges and universities _____ ____ ____ since 1949.(built)
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解析：
| has
been built；since引导的时间状语用完成时态。
|
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题目内容
语法A great number of colleges and universities _____ ____ ____ since 1949.(built)
| has
been built；since引导的时间状语用完成时态。
|