5．-We didn't see Robert at the opening ceremony yesterday．
-No，he _______ it．（　　）
A．mustn't have attendedB．needn't have attended
C．needn't attendD．didn't need to attend

分析 ---在昨天的開(kāi)幕式上我們沒(méi)有看到羅伯特．
---是的，他沒(méi)有必要參加．

解答 答案：D
根據(jù)回答句"No"可知，Robert 昨天確實(shí)沒(méi)有來(lái)．"need to do"意為"必要做…"為實(shí)義動(dòng)詞，結(jié)合"yesterday"時(shí)間，所以否定形式為"didn't need to"．need+do則為情態(tài)動(dòng)詞，need+to do則為實(shí)義動(dòng)詞．

點(diǎn)評(píng) 本題考查情態(tài)動(dòng)詞．難度適中，考生需掌握情態(tài)動(dòng)詞的用法，比如need做情態(tài)動(dòng)詞和實(shí)義動(dòng)詞的區(qū)別，在具體的句子中正確使用．

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