The three men tried many times to sneak across the border into the neighbouring country, ______ by the police each time.
【正确答案】 C
【答案解析】only to这一不定式作结果状语,意为“不料,结果”,因此C为正确答案。A项是谓语动词的过去完成时,不能作状语;B项的现在分词状语表示原因或伴随等,不表结果,意思不对,所以不选;D项的过去分词captured只表示某一次的动作,与each time相矛盾。