have been [hæv bɪn]

以下由轻松背单词网站提供

词组级别

附加级

基本释义

(+-ing动词)：现在完成进行式

参考例句

Most of these tools have been specially adapted for use by disabled people. 这些工具多数已经过特别改装，供残疾人使用。
Several factors have been adduced to explain the fall in the birth rate. 有几个因素已被援引来说明出生率降低的原因。

have been [hæv bɪn]

词组级别

基本释义

参考例句

推荐阅读