问题描述：
it is rather difficult to make with,but his friendship,___,is moretrue than anyone else's A.once
A.once gained B.when gaining C.after is gained D.having gianed
为什么选A呢?
A.once gained B.when gaining C.after is gained D.having gianed
为什么选A呢?
问题解答：
我来补答展开全文阅读