Mr. Black has been teaching English in a middle school he came to China. A. for everB. ev

问题补充：

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

A. for ever

B. ever since

C. since then

D. long before

答案：

A. for ever

(答案→)B. ever since

C. since then

D. long before

解析：本题考查连词词组。for ever永远，总是；ever since从那时到现在；since then以前；long before很久以前。句意：布莱克先生从他到中国到现在他一直在一所中学教英语。