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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 ---在昨天的开幕式上我们没有看到罗伯特.
---是的,他没有必要参加.

解答 答案:D
根据回答句"No"可知,Robert 昨天确实没有来."need to do"意为"必要做…"为实义动词,结合"yesterday"时间,所以否定形式为"didn't need to".need+do则为情态动词,need+to do则为实义动词.

点评 本题考查情态动词.难度适中,考生需掌握情态动词的用法,比如need做情态动词和实义动词的区别,在具体的句子中正确使用.

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