Only until very recently_______possible

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问题 Only until very recently_______possible that grammarians are able to make accurate statements about the rules of some languages.A. has it beenB. it has beenC. was itD. it was

选项 A. has it been
B. it has been
C. was it
D. it was

答案 A

解析 本题考查倒装。句意为“直到最近,语法学家才能够对一些语言规则进行精准阐述”。当“only+ 状语”位于句首时,主句要用部分倒装,即把谓语的一部分如助动词或情态动词放至主语的前面。根据后半句中的 are able to 可知本句为现在时态,故排除 C、D。
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