单选题 Computers are ＿＿＿＿＿＿ a great technological improvement which saves people much time and energy. 的答案
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题目内容：
Computers are ＿＿＿＿＿＿ a great technological improvement which saves people much time and energy.
题目选项
参考答案价值：100%
题目内容：
Computers are ＿＿＿＿＿＿ a great technological improvement which saves people much time and energy.
题目选项
参考答案价值：100%
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