单选题The ______ of heavy equipment should be left to professionals because of the safety regulations.A operateB operationC operatedD operator

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单选题

The ______ of heavy equipment should be left to professionals because of the safety regulations.

operate

operation

operated

operator

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单选题The ______ of heavy equipment should be left to professionals because of the safety regulations.A operateB operationC operatedD operator

题目内容(请给出正确答案)

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