【題目】 the difficult maths problem, I have consulted Professor Russell several times.

A. Working out B. Worked out C. To work out D. Work out

【答案】C

【解析】句意:為了解決這個數(shù)學(xué)問題,我已經(jīng)向拉塞爾教授咨詢了好幾次。根據(jù)句意可知,空格處用動詞不定式表示目的。故 C項正確。

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