1.Nowtheairpollutioninthiscity___moreandmoreseriouswitheachpassingday.
A.becomingB.isbecoming
有now要用进行时态我知道了,这个is为什么要加?
2.Peopleinvestmoneyinthiscompany_____theybelieveitwillmakeprofits.
A.becauseB.unlessC.until
怎么感觉三个选项意思上都对啊