A-A+
After several days' investigation the police
问题详情
After several days" investigation, the police found out one clue that voices were heard ______for help from some very distant place that night.
A．to call
B．called
C．calling
D．call
参考答案
正确答案：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。该句的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，因此可排除D ;call的逻辑主语是voices，二者是主动关系，因此可排除B 。此外，由于事情已经是过去，因此排除A 。故C 正确。
