If anything_____the machine ,please let us know.A.happens onB.happens to

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If anything_____the machine ,please let us know.A.happens onB.happens to
If anything_____the machine ,please let us know.
A.happens on
B.happens to

If anything_____the machine ,please let us know.A.happens onB.happens to
用happens to,全句意思是“如果机器出了什么问题,请通知我.”
happen to sb/sth意思是“出了(问题),发生(意外)”,通常指“出了意想不到的(坏)事情”.又如:An accident happened to him.他出了事故.
happen on意思是“偶然碰到,偶然发现”,例如:The two men happened on each other by chance.那两人偶然碰了面.