问题
选择题
He advised farmers to choose the best seed-heads ,__________ that had the best color .
A.不填
B.ones
C.this
D.the ones
答案
答案:D
不定代词one是泛指,相当于a/an + 名词,ones相当于复数,特指时需要加the,句意:他建议农民选择最好的种子,有最好颜色的种子。横线后面为定语从句,应是特指,所以用the ones,ones指seed-heads,故选D。