In recent years speculation has abounded that Albert Einstein can have had Asper

游客2024-12-29 21

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

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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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