【单选题】【消耗次数：1】
Great changes __________ in our institute in the last few years.
①
have taken place
②
has taken place
③
took place
④
had taken place
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相关题目
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随机题目
【单选题】
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①
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②
所有紧前工作最早完成时间的最小值
③
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【单选题】
下列（ ）说法是错误的。
①
总时差为零的工作是关键工作
②
由关键工作组成的线路是关键线路
③
总时差为零，自由时差一定为零
④
自由时差是局部时差，总时差是线路性时差