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He had some ___in working out the problem.why using difficul

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He had some ___in working out the problem.why using difficulty not difficulties?
some在这里不是表示数量的意思,而是强调“有”(可用于肯定与疑问中),修饰可数名词与不可数名词均可.would you please lend me some money?用some表示希望对方也相信对方会借钱给自己,如果some换成any就是不太确定对方是否要借.
difficulty在这里是指抽象意义的“困难,艰难”,是不可数名词,作为可数名词时通常的意义是“(某一)困难的事”
所以这里用difficulty 而非difficulties.