问题描述：
there are a pair of trousers.请问用is还是are?
1、There are a pair of trousers.请问用 is 还是 are?2、This is a pair of trousers.请问用 is 还是 are?3、This is a truly enlightened world .用 a还是 an?
1、There are a pair of trousers.请问用 is 还是 are?2、This is a pair of trousers.请问用 is 还是 are?3、This is a truly enlightened world .用 a还是 an?
问题解答：
我来补答展开全文阅读