１.I have kept the books for 3 weeks.I___them to the library last week.a.ought to have returnedb.ought to return ould returnd.ought have returned 我選的是C，正確答案是A．為什么？2.It'll make me ___if you'll accept it. happily happy ch happiness ch happily 正確答案是Ｂ．為什么？

熱心網友

1.oughttohavedone是表達過去本應該做。。。而實際上沒有發生的結構。 kesomeonesohappy.形容詞做賓語的補足語。

熱心網友

補充一下,should 和ought to 一般可互換，但ought to 一般用于肯定句