lt isn't --- but there's always so much to do on the farm.

问题描述:

lt isn't --- but there's always so much to do on the farm.
A.a big B.one big
C.big one D.a big one
one是不定代词吗?选哪个?
风唱梵音

d one是不定代词,那为什么还能加a?one代替某个东西,数量是a