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This machine is very easy ______. Anyone can learn to use it in a few minutes.
A.operatingB.to be operatingC.operatedD.to operate
D

试题分析:考查不定式的固定句型:句意:这个机器很容易操作,任何人几分钟就可以学会。使用了Sb/sth is+adj+to do这个句型,其中不定式要用主动表示被动,选D。
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