这两道题考察情态动词.
1C 情态动词+have done 的结构.Should have done.本应该做却没做.= ought to have done.
2 C 情态动词在虚拟语气中的用法.直白点说,当所说的事情已经发生时,就是表示过去的事,我们选择的从句IF + 过去完成时,主句+ would. should. could. might + have done. 这是虚拟语气的固定结构.
英语选择,要解析We____our intentions to him before asking him to do
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