The moment they received a ticket, they were extremely upset abo

The moment they received a ticket, they were extremely upset about __________ （fine） for over-speed.
【正确答案】：being fined
【题目解析】：介词about后面要用名词性的词作介词宾语，此句表示担心因超速而被罚款，fine此句中是动词表示“罚款”，且需要用被动态，因此用它的表被动的分词形式。