has become。因為has后面要接動詞的過去分詞形式，動詞become的過去分詞是become，became是動詞become的過去式。become作及物動詞時意為“成為；變得；變成”，第三人稱單數(shù)變化是becomes；現(xiàn)在分詞形式是becoming。

has become的例句

The environment has become a very hot issue.

環(huán)境已成為很熱門的話題。

The Internet has become part of everyday life.

互聯(lián)網(wǎng)已成為日常生活的一部分。

The new office block has become an expensive white elephant.

這座新辦公大樓成了昂貴的擺設。

May Day has become a venerable institution

五朔節(jié)已經變成一個神圣莊嚴的傳統(tǒng)節(jié)日。

The programme has become a firm favourite with young people.

這個節(jié)目已著實贏得了年輕人的喜愛。

become相關短語

become rich疾速致富；迅速致富；火速致富；神速致富

become extinct滅絕；變壞；絕種

has become成長為；已經成為；已變成；已經變成

become conscious醒悟；恢復知覺

become weak手發(fā)軟；變得萎靡不振；倦??；變弱

become invalid作廢；成為無效；變得無效；這藥已失效了