问题
选择题
Many people have been ill from a strange disease these days，________ we’ve never heard of before．[ ]
A．it
B．that
C．one
D．this
答案
答案：C
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Many people have been ill from a strange disease these days，________ we’ve never heard of before．[ ]
A．it
B．that
C．one
D．this
答案：C