that's chenged since i come here的's为何不是was的缩写,（那被改变,自从…………）that's changed since i came here的's为何不是was的缩写,（那被改变,自从…………）changed题目打错了

that's chenged since i come here的's为何不是was的缩写,（那被改变,自从…………）that's changed since i came here的's为何不是was的缩写,（那被改变,自从…………）changed题目打错了 that's changed since i came here中 that's是什么的缩写? That’s changed since I was here.That’s changed since Iwas here.这个句子中,'s可以改成was么?为什么？ since then可以说成 since that time 第一段的最后一句,that's changed since i was here中,that's 是that is 的缩写还是that has的缩写 It's strange that the young man has kept () since last monthA,hiccupB,hiccuppingC,hiccupingD,hiccupped it's not all that long ago since ……中的all怎么理解? Anne said,That's cahnged since I was here.的间接引语Anne said,That's changed since I was here.这句话变成间接引语是Anne said that that had changed since I had been thre 还是 Anne said that that had changed since I was there.原因 Since the day that you were gone说说s v adj谁修饰谁that 从句修饰谁 _they couldn't talk at the meeting,she _her husband's eye to show that she wanted to leaveA.since;gotB.since;caughtc.thought;gaveD.as;showed since that 和 now that区别~ productivity 原句是：So long as something was chenged ,productivity rose. it's +时间+since/that/when/before句型用法的差别它们分别有什么条件吗? 高一英语必修一第一单元 That’s changed since I was here.中的was可不可以换成came? It's said that the poor man——（lie）in bed since the end of last month Since there is noting to be discussed,let's end the meeting.开头为什么不能是for或in that? It's almost three years ____ I last saw her.A.since B.when C.that D.after 关于since It's almost three years____I last saw her.A.since B.when C.that D.after答案是选A,但不是说since 只能用于完成时的吗?此题做何解释呢?