has become
还是has became
has become
。由于has后面要接动词的过去分词形式，动词
become
的过去分词是
become
，became
是动词become
的过去式。
become
作及物动词时意为
"成为；变得；变成
'
，第三人称单数转变是
becomes
；如今分词形式是
becoming
。　　1、has become
的例句　　The environment has become a very hot issue.
　　环境已成为很热门的话题。
　　TheInternet has become part of everyday life.
　　互联网已成为日常生活的一局部。
　　The new office block has become an expensive white elephant.
　　这座新办公大楼成了昂贵的摆设。
　　May Day has become a venerable institution
　　五朔节已经变成一个神圣庄重的传统节日。
　　The programme has become a fir ...