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

試題分析：考查不定式的固定句型：句意：這個機器很容易操作，任何人幾分鐘就可以學會。使用了Sb/sth is+adj+to do這個句型，其中不定式要用主動表示被動，選D。
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