Only until very recently__
Only until very recently_______possible that grammarians are able to make accurate statements about the rules of some languages.
A. has it been
B. it has been
C. was it
D. it was
A. has it been
B. it has been
C. was it
D. it was
参考答案:A
参考解析:正在整理中,欢迎在文下评论区提供答案解析,谢谢!