had to have to 是什么用法 原句: The conditions had to have been really bad.

如题所述

第1个回答  2012-05-12
had to是have to的完成时,第一个have后需加完成时,而I had to只是单纯的过去时。另外,have to为不得不的意思,后面要加动词原形。
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