（2012辽宁卷）This machine is very easy . Anybody can learn to use it in a few minutes.
| A． operating | B． to be operating | C． operated | D． to operate |
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（2012辽宁卷）This machine is very easy . Anybody can learn to use it in a few minutes.
| A． operating | B． to be operating | C． operated | D． to operate |
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