应选B
给你简单解释一下：
句意：如果我们不现在出发的话,我们将可能错过火车.
risk doing/sth.:冒...的危险,可能（失去）...
所以此处需要一个名词或动名词,A D错.
miss做“错过”讲的用法是 sb.miss sth.所以we 与miss是主谓关系,不是被动.
所以只能选B.
英语选择5.If we don’t start out now,we must risk ______ the trai
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