2. 外语
  3. Studies have shown that humans working with machines are ________ than a human or a machine working alone.

Studies have shown that humans working with machines are ________ than a human or a machine working alone.

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问题 Studies have shown that humans working with machines are ________ than a human or a machine working alone.
选项 A、more effective
B、most effective
C、effective
D、least effective
答案A
解析 根据句意，存在比较级标志词than，故应用形容词effective比较级形式。故选A。
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