It's hard to believe that some old textbooks published ten years ago______in our university today.A.are using B.are being used C.have used D.were used

It's too hard to believe it.这个句子是病句.但如何理解? it's hard to ( ) is wrong to believe that it’s hard to changeyour behaviour 歌词第一句是it's hard to believe的歌,歌名是什么? It‘s so hard to believe that you don‘t like me. There can be miracle when you believe; though hope is frail,it's hard to kill it's hard to tell~ “It's hard to die. it's hard to believe that such a greedy man can donate so much .为什么用can 找一首英文歌,里面唱it's too good to be true it's too hard to believe,是个男的唱的,节奏很快,求名 There can be miracles when you believe.There can be miracles when you believe,Though hope is frail it`s hard to kill.译下全句 It's up to you.I believe It's hard to comments to me. it's hard to make living It's hard to die怎么解释? It's hard to study English. 有没有It's hard to me it's very hard to p___everyone