问题
选择题
Those_____ have caught H1N1 disease must be kept off from us.
A．who
B．which
C．/
D．what
答案
答案：A
题目分析：句意：那些得H1N1流感的人们必须与我们隔离。those做定语从句先行词时，当其指物关系词用that/which等，当其指人时，关系词用who等。Those在这里指代人们结合句意，故选A.
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