Ihaddifficulty

问题详情：

I had difficulty _______ the maths problem.

A. working out         B. work out                   C. to work out            D. works out

【回答】

A  have difficulty (in) doing sth.意为“做某事有困难”，为固定搭配。work out计算出。

知识点：动词和动词短语

题型：选择题