It is believed that some illnesses are related to______was eaten.

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问题 It is believed that some illnesses are related to______was eaten.

选项 A、which
B、it
C、what
D、that

答案C

解析 分析句子结构可知,to之后为宾语从句,从句中缺少主语,所以应用连接代词what引导。故选C。
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