【題目】_______ 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】

考查不定式作目的狀語(yǔ)。句意:為了算出這道數(shù)學(xué)題,她已經(jīng)咨詢了劉教授好幾次了。根據(jù)句意可知句中的不定式to work out …表示目的。這也是不定式的主要用法之一,故B項(xiàng)正確。

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