【正确答案】 B

【答案解析】[解析] 我向你保证没有一点危险。ensure保证。用与ensure sth. 或ensure that...如：Great efforts ensure the success of our work. 巨大的努力确保了我们工作的成功。assure保证。用于assure sb. of sth. 或者assure sb. that…最符合题意。如：We can assure you that we are well experienced in this line. 我们可让你们确信我们在这行是非常有经验的。insure投保。如：The reason they want to pay is because they want more clients to insure.他们之所以愿意支付，是因为他们希望有更多的客户投保。secure使…安全；设法做到。如：He secured the release of the hostages．他已经设法使人质获释。