5.The manager entered the office and was happy to learn that

5.The manager entered the office and was happy to learn that four-fifths of the tickets _____.B.had been booked 不知道为什么,接连回答了您的好几个问题,但发现这个题所给的答案A好像是说不通的.因为分数短语作主语时,谓语动词是否用单数,得看它所修饰的名词.像这道题,四分之三的票,tickets,所以后边不该用单数的was.我认为应该用过去完成时态.“经理进入办公室,很高兴的听到四分之三的票已经被卖完了”.