单选题Only until very recently _________ possible that grammarians are able to make accurate statements about the rules of some languages.Ahas it beenBit has beenCwas itDit was
单选题
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
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解析：
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