I know this has been hard.has been 是什么语法?

I know this has been hard.has been 是什么语法? I want to know ____：Has Mr.Jones been here the whole morning?A.it B.one C.that D.this不能选c的理由 Don't know ,I've been trying ,but also has been lost This account has been blocked. this file has been damage This IP has been banned Finally met jim at school this morning but where____he last week?I Finally met jim at school this morning but where____he last week?Don't you know?He____ill for the whole five day.A is;has been B is;had beenC was;has been D was;had been I didn’t know this was the first time you _________ here.I _____ you had been here at least onceA.have come; think B.has come; have thoughtC.had come; have thought D.had come; thought When did you know that I has been a Devil of your missing? Where is Peter I don't know where he has ____ gone还是been ,请详解, I do not know why there has been misunderstanding between us. i just know this I know this() I know,always this ----I know your brother has been to Ezhou once.----Yes.He____three on business last month.A.has been B.has gone C.goes D.went He ------- Beijing .I don't know when he did it.A has gone to B has been to选哪个 BECAUSE OF YOU MY LIFE HAS BEEN BETTER ONE I WOULD LIKE TO TAKE THIS MOMENT I am sorry this has been a one side conversation message