(Cigarette smoke) has been shown to contain numerous compounds that (are known t

游客2025-05-09 32

问题 (Cigarette smoke) has been shown to contain numerous compounds that (are known to) cause cancer in experimental animals and (they) appear to be strongly (linked to) human cancer, especially cancer of the lung

选项 A、Cigarette smoke
B、are known
C、they
D、linked to

答案 C改为that

解析前后两个that从句由and连接，并列做定语修饰compounds。

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