-- Does a UFO really exist? -- No one cann be sure. Maybe it

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-- Does a UFO really exist? -- No one cann be sure. Maybe it ___ a mystery forever.
A. is remained B. will remain
C. has remained D. remains

-- Does a UFO really exist?-- No one cann be sure.Maybe it ___ a mystery forever
A.is remained B.will remain
C.has remained D.remains
选项是B
如果我的回答对你有所帮助,请点击本页面中的“选为满意回答”按钮,
再问：为什么选B阿阿阿~
再答：因为forever的意思是【永远】，【永远】就是未来/将来，所以就选 will remain 你说是吗？如果我的回答对你有所帮助，请点击本页面中的“选为满意回答”按钮，谢谢！

No one can be sure _________in a million years. people believe that UFO does exist.（用it 开头改写句子）,_________tha Does Glass Ceiling really exist? 作文 Maybe it was a cry for help.But no one was listening.--Jenni 英语语法20No one can be sure ____in a million years.A.how human No one can be sure ___ the board will accept our condition A 【名词性从句】no one can be sure _ in a million years no one does it better是什么意思 I WANT TO DIE .NO ANY PURPORT .MAYBE ONE DAY I REALLY DO LE 英语翻译58、Why does home milk delivery no longer exist?A：Nobody 英语翻译No one is sure when the idea of April Fool's Day really no one can be sure 加句子是什么从句呢?为什么 sure 是什么成分什么词性?