【題目】I am afraid he has some difficulty the chemistry problem．

A. to work on B. to work out

C. in working on D. in working out

【答案】D

【解析】

試題分析：句意：恐怕他解出這個化學(xué)題有些困難。have difficulty in doing sth 做某事有困難 work out 解決；算出；實(shí)現(xiàn)；結(jié)合句意可知，答案為D。

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