Question

【题目】

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

A. Working out B. Worked out

C. To work out D. Work out

Answer 1

【答案】C

【解析】句意:为了解决这个数学难题,我已经向拉塞尔教授咨询了好几次。根据句意可知,空格处用动词不定式表示目的。故 C项正确。