Tom was the second _______this maths problem.

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Tom was the second _______this maths problem.
A.worked out B.works out C.working out D.to work out
问为什么

D.to work out
序数词 +（名词）+to do sth ,不定式to do sth做定语,修饰前面的名词的.有时名词可以省略,这里省略了名词

Tom was the second _______this maths problem. 反义疑问句tom could hardly work out the maths problem The maths problem was too difficult.____worked it out. TOM finds the maths problem very hard (对VERY HARD 进行提问） the maths problem was so difficult that nobody could work it mike said he was thinking about （）the maths problem at that The maths problem was too difficult for students of our grad maths problem the maths problem is ____ that one The maths problem is not easy( ) Of all the （ ),Tom likes Maths best. The twins fails to work out the maths problem.