题目内容

Mr. Black has been teaching English in a middle school _____ he came to China.
A．for everB．ever sinceC．since thenD．long before
B
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。
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