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This machine is very easy      . Anybody can learn to use it in a few minutes.
A. operatingB. to be operatingC. operatedD. to operate
D
在句型“主语+be+adj+to do”中,如果这个主语是动词do的逻辑宾语,故用主动表被动,所以选D。
【考点】非谓语动词
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