问题描述：
if you （break） this window you would have to pay for it he would enjioy the concert if he （
had been ）present if you（ can） help me i would be grateful 括号里的词语对吗
had been ）present if you（ can） help me i would be grateful 括号里的词语对吗
问题解答：
我来补答展开全文阅读