【C20】A．canB．shouldC．willD．must

Tom _______ have kept his promise. I wonder why he changed his idea.A、needB、shouldC、must

Im glad that your story ______ have won the first prize.A．couldB．shouldC．mightD．must

【C20】A．canB．oughtC．willD．need

【C9】A．couldB．shouldC．mayD．must

【C5】A．oughtB．shouldC．wouldD．could

【C6】A．wouldB．shouldC．mustD．might