-- Does a UFO really exist? -- No one cann be sure. Maybe it ___ a mystery forever.
题目
-- 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
答案
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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