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  3. Only until very recently______possible that grammarians are able to make accurate statements about the rules of some languages.

Only until very recently______possible that grammarians are able to make accurate statements about the rules of some languages.

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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.
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。故本题选A。
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