题目内容

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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