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  3. Such animals as South China tigers are believed______, for we’ve had no track of them for ages.

Such animals as South China tigers are believed______, for we’ve had no track of them for ages.

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问题 Such animals as South China tigers are believed______, for we’ve had no track of them for ages.
选项 A、becoming extinct
B、to become
C、to have been extinct
D、having been extinct
答案C
解析 be believed to…为固定搭配，相当于it is believed that…,因此排除A、D。根据空格后的句子“for we’ve had no track of them for ages”(因为我们已经很久没有发现他们的踪迹了)可知，此处应为完成时，因此C项正确。
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