UNIT 4 ADVERSITY AND COURAGE突破语法大冲关123456789has been playinghave been building10has been climbinghas been doing11has been ringinghave been waitinghas been workinghas been phoninghave been building12has writtenhas been dealinghas been typing13have been gettingto gohave been studyinginonhave been learninghave wastedgoinghave been staying14have been writing15点 击 右图 进 入 课时分层作业16Thank you for watching!17