If anything _________ the machine,please let me know.A.happens to B.happens on C.happened to D.happened on

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If anything _________ the machine,please let me know.A.happens to B.happens on C.happened to D.happened on
If anything _________ the machine,please let me know.A.happens to B.happens on C.happened to D.happened on

If anything _________ the machine,please let me know.A.happens to B.happens on C.happened to D.happened on
选A
用happens to,全句意思“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.