Question

Jack _______yet，otherwisehe would have telephoned me．

1. A.
   mustn't have arrived
2. B.
   shouldn't have arrived
3. C.
   can'thave arrived
4. D.
   need not have arrived

Answer 1

C
本题中otherwise为连词，意思是“否则，要不然”。would have telephoned表达虚拟，实际相反，即“他并没有打电话”，所以空格处can't have arrived是对过去情形进行语气强烈的否定推测，意即“他不可能回来了”。