Tom went through the documents again carefully for fear of ______ any important data.

【正确答案】 B

【答案解析】 动词词义辨析。根据句中for fear of(以免)判断，空格应填入与carefully意思相对的动词。选项中，overlook意为“忽略，遗漏”，符合要求。故答案为B。