11.A,他一定是出事了,否则他应该在这里.（虚拟语气）
12.D,申请表必须在截止日期之前寄回,这一点很重要.（过去发生的事情用过去时）
13.D,当那位老人来到门口时我们刚吃完早餐.（过去完成时）
14.A,雨非常大以至于土地被淹.（因果关系）
15.D,孩子们去看铁塔被竖起.（动名词）
11.He must have had an accident,or he _____ then.
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