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If Robinson______(learn) how to swim, he wouldn’ t have been trapped on that isl
If Robinson______(learn) how to swim, he wouldn’ t have been trapped on that isl
游客
2023-09-23
50
管理
问题
If Robinson______(learn) how to swim, he wouldn’ t have been trapped on that island.
选项
答案
had learned
解析
从主句would have been trapped可知题中描述的是与过去事实相反的的假设,因此if从句应用had done的形式。
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