Question

Helping others is a habit, _____ you can learn even at an early ag

Helping others is a habit, _____ you can learn even at an early age. A．it B．that C．what D．one

Answer 1

D

试题分析：句意：助人为乐是一种习惯，甚至你可以在很小的时候就可以学会它。one=a/an+单数可数名词，句中相当于a habit，故选D 点评：it／one ／that三者均可用作代词, 指代前面提到的名词。一般说来, it指代同名同物; one与that则指代同名异物。one只能代替可数名词单数, 代替可数名词复数时用ones ，those; that既可以代替不可数名词也可以代替可数名词单数, 代替可数名词复数时those。