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【题目】_______ the difficult maths problem, she has consulted Professor Liu several times.

A. Worked out B. To work out C. Having worked out D. Work out

【答案】B

【解析】

考查不定式作目的状语。句意:为了算出这道数学题,她已经咨询了刘教授好几次了。根据句意可知句中的不定式to work out …表示目的。这也是不定式的主要用法之一,故B项正确。

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