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先请看下列句子;①There was no one in the street____the policemen on duty.②The street Wit s e mpty____the policemenn on duty.③I know nothing about it____what 1 heard from you.④Everyone was right____me.以上四个句子的空白处,该用 except 还是 except for?这是初学者常常遇到的难题。正因为二者都表示“除……之外”