2. 外语
  3. In recent years speculation has abounded that Albert Einstein can have had Asperger syndrome.

In recent years speculation has abounded that Albert Einstein can have had Asperger syndrome.

admin2011-07-28  32
问题 In recent years speculation has abounded that Albert Einstein can have had Asperger syndrome.
选项
答案can——must
解析 表示对过去事实肯定的猜测，结构是must have done sth．，反之，结构应为can’t have done sth．。
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