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–How long has John _______?–For almost eight months. A．become an engineer B．stayed in Beij

考查動詞。根據下文大約的八個月，英語中表示壹段時間的時間狀語不能與延續性動詞連用，選項ACD都表示瞬間動作，故選B，只有選項B為延續性動詞，其余都不是。