The pigs ___ on the corn do not weigh so much as ___ on the rice.
问题描述：
The pigs ___ on the corn do not weigh so much as ___ on the rice.
A.feed ,those B.feeding,those C.fed,that D.feeding,ones
which one?why?
答
答案是 B.feeding,those
The pigs (feeding) on the corn do not weigh so much as (those) on the rice.
feeding 是形容词短语 (adjective phrase) 里的现在分词
feeding on the corn 是形容词短语,修饰 The pigs .
those 是 代词,those 代表那些 (pigs feeding) on the rice .