【正确答案】 B

【答案解析】此题属于词语搭配题。选项[B]apt：be apt to do sth．表示“倾向于，习惯于”，例如：A careless person is apt to make mistakes．<一个粗心人往往犯错误)。因此[B]符合题意和语法。选项[A]used：be used to sth．/doing sth．表示“习惯于”，例如：He has been used to the weather here．选项[C]possible的用法是It is possible that...或It is possible for sb．to do sth.,例如：It is possible that I shall go there tomorrow．选项[D]probable用法为：Something．is probable或It is probable that...，例如：It is probable that it will rain．这三项都与原句不符，故选[B]。