be glad of 与be glad at 的区别

be glad of 与be glad at 的区别 be glad 和be happy 的区别 be glad "glad to help" AND "glad to be of help" be glad start for be glad to see be very glad to be glad that+从句 be glad的用法及例句 He will be more than glad ___there are plenty of books at ha be glad to do sth 还是be glad doing sth be glad that怎么翻译?