I think __our duty to keep our evirionment clean an tidy.A.this B.that C .it D.it's

I think __our duty to keep our evirionment clean an tidy.A.this B.that C .it D.it's I don't think I don't think I think ,I don't I think it my duty to write to you and thank you.(改为复合句)I think it ____ my duty ____ ____ to you and thank you. I think it my duty to write to you and thank you.(改为复合句)I think that it ____ my duty ____ write to you and thank you. I think it our duty to study.I think it completeI think it our duty to study.I think it complete a waste of money.为什么第一句是对的,第二句却是错的? I think it our duty to study.I think it completeI think it our duty to study.I think it complete waste of money.为什么第一句是对的,第二句却是错的呢? i don't think it's my __that the TV blew up.i just turned it on;that's all.A errors B mistake C faults D duty选B 为什么其他的不行 I think it's our duty to keep our environment clean and tidy. I think he is on duty today.为什么用ON,可以去掉吗 I think Ann must____on duty today A.be B.is C.are D.am为什么? I think it’s my duty to live a low-carbon life. 填介词； (1) Who's ( ) duty today? (2) I think Chinese food is different ( ) western food. I think It's my duty ______ make meals for my childen.不可灌水 I think it my duty to write to you and thank you.翻译 i don't think so 翻译,i don't think