Mr. Black has been teaching English in a middle school _____ he came to China.
A．for everB．ever sinceC．since thenD．long before
B
本題考查連詞詞組。for ever永遠，總是；ever since從那時到現(xiàn)在；since then以前；long before很久以前。句意：布萊克先生從他到中國到現(xiàn)在他一直在一所中學教英語。
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