The elderly _________ good care of in public places like supermarkets and airports; they are likely to get lost.
A．can have been takenB．ought to be takingC．must be taken D．should take
C
考查情態(tài)動(dòng)詞。句意：上了年紀(jì)的人必須在公共場(chǎng)合被很好的照顧，像超市和機(jī)場(chǎng)，他們很可能會(huì)迷路。故選C。
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