has become是現(xiàn)在完成時(shí)。
例句：
May Day has become a venerable institution.
國(guó)際勞動(dòng)節(jié)已經(jīng)成為一個(gè)神圣莊嚴(yán)的既定節(jié)日。
Her relationship with Mark has become stale.
她和馬克的關(guān)系已變得乏味了。