If Robinson______(learn) how to swim, he wouldn’ t have been trapped on that isl

游客2023-09-23 18

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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