10months has passed,but chinese people still remember those excting days _____they spent during the BEIJING 2008 Olmpic games .A.that B.who C.when 为什么 when可不可以解释成 ……的时候

Three months has passed since he moved to this More than two months ____ already.A.passed B.have past C.has passed D.have passed为什么是单数? Three months __ since he __ hereA have passed;leftB has passed;leftC has past;has leftD has passed;was away two months has passed since he joined the army为什么用has而不用have Fifteen months ______ not a long time ,but fifteen months ______ passed since we met last time.第二空是has吧? 10months has passed,but chinese people still remember those excting days _____they spent during the BEIJING 2008 Olmpic games .A.that B.who C.when 为什么 when可不可以解释成 ……的时候 Two months has passed since i started to study at Beijing University为什么是用has 不是 have 老师讲的我没听懂、、、 明天期中考 ten years have passed还是has passed 2 years has passed还是have passed was passed和has passed的区别? It has passed 10 years since we met last time. Three months has passed before we learnt the death of the president.Three monthshas passed before we learnt the death of the president..这句话有时态上面的错误么? What has passed is past . they have been in nanjing since ______.A.three weeks B.three days before C.four months agoD.next weekseveral days has passed _____ the air carsh happened.A.since B.after C.as D.before · six years__since she left chengdu.A has passed B had passed C passed “Day has passed.Another day again 一定要说明理由 Five years _____since he died.A.have passed B.has passed C.is passed D.are passed Four months __ passed by since we met last time.Four months ___ a short time.a.has; isn't b.have; isn't 选A,第一个空可以看作整体,也可以肯做个体吧?用have也可以的吧?单数和复数在这样的情况下怎么辨别?