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the news? — I don’t remember clearly. It ______ Mary. — It ______ Mary. She doesn’t know it. A. may have been。 can’t be B. can be。 mustn’t be C. must have been。 can’t have been D. may have been。 may not be 二、 比較選擇 1. It’s very dangerous. You _______(must/mustn’t) keep away from it! _______(could/mustn’t) still win – the game isn’t over yet. (Move/Don’t move) the boy if he’s broken his arm. (Keep/Don’t keep) the boy warm. He’ s freezing 課后反思 : 課后訓(xùn)練 復(fù)習(xí)本堂課所講內(nèi)容