He always helps other people _____.为什么填in his life而不填in his lives?
问题描述：
He always helps other people _____.为什么填in his life而不填in his lives?
答
“life”作可数名词（countable noun）时意为“生命”,作不可数名词（uncountable noun）时意为“生活”.很明显,在此是“生活”之意,故填“in his life”.