2. 外语
  3. After several days’ investigation, the police found out one clue that voices were heard______for help from some very distant pla

After several days’ investigation, the police found out one clue that voices were heard______for help from some very distant pla

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问题 After several days’ investigation, the police found out one clue that voices were heard______for help from some very distant place that night.
选项 A、to call
B、called
C、calling
D、call
答案C
解析 非谓语动词题。该题考查的是非谓语动词作定语的情况。该句同位语从句的主语是voices，谓语是were heard，很显然call在句中为非谓语动词，排除D；call的逻辑主语是voices，二者是主动关系，排除B。此外，由于事情已经过去，不能用来表“将来”，故排除A。故C正确。
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