【单选题】【消耗次数：1】
Three-fourths of the homework ____ today.
①
has finished
②
has been finished
③
have finished
④
have been finished
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随机题目
【单选题】
权数对算术平均数的影响作用，实质上取决于
①
作为权数的各组
单位数占总体单位数比重的大小
②
各组标志值占总体标志总量比重的大小
③
标志值本身的大小
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标志值数量的多少