.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

試題分析：考查固定詞組：A. for ever曾經(jīng)，B. ever since自從，C. ever before以前，D. long before很久以前，句意：自從布萊克先生到中國來一直在中學(xué)教英語。和ever since+從句，連用的主語是現(xiàn)在完成時(shí)，選B。
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