We should think of [ ] old and [ ] sick A a,a B an ,a C the,the D/,/RT说明原因

问题描述:

We should think of [ ] old and [ ] sick A a,a B an ,a C the,the D/,/
RT说明原因

C the; the
the+形容词表示有此类特征的人,如the old老人,the sick病人