问题补充:
The elderly good care of in public places like supermarkets and airports; they are likely to get lost.
A. can have been taken
B. ought to be taking
C. must be taken
D. should take
答案:
A. can have been taken
B. ought to be taking
(答案→)C. must be taken
D. should take
解析:词义辨析。主语The elderly和take good care of是动宾关系,要用被动形式,排除B,D;can have been taken,可能已经被照顾;must be taken必须被照顾。句意:老人在公共场所,例如超市和机场,必须被好好照顾;他们很可能会迷路。所以选C。