When ( ) help,one often says"Thank you"or"It's kind of you"
A.offering B. to offer C.to be offered D.offered
答案是D 谁能解释一下为什么
When ( ) help,one often says"Thank you"or"It's kind of you"
A.offering B. to offer C.to be offered D.offered
答案是D 谁能解释一下为什么