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.Mr. Black has been teaching English in a middle school _____ he came to China.

A.for ever B.ever sinceC.ever beforeD.long before

B

解析试题分析:考查固定词组:A. for ever曾经,B. ever since自从,C. ever before以前,D. long before很久以前,句意:自从布莱克先生到中国来一直在中学教英语。和ever since+从句,连用的主语是现在完成时,选B。
考点:考查固定词组

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