Old people must_______.
A. look after well
B. be looked well after
C. looked well after
D. be looked after well
【答案】D
【解析】句意：必须照顾好老人。考查情态动词的被动语态和动词短语。好好照顾：look after well；情态动词的被动语态：情态动词+be+动词的过去分词；结合句意和语境可知选D。
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