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

A. for ever B. ever since C. ever before D. long before

 

B

【解析】

試題分析： 考查連詞辨析 句意：布朗先生自己來(lái)中國(guó)一直在中國(guó)任教。根據(jù)Mr. Black has been teaching English in a middle school可知選B項(xiàng)。

考點(diǎn)： 考查連詞辨析

 

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