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The factory has been (open)since two years ago .

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The factory has been (open)since two years ago .
用括号内动词的正确形式填空
The factory has been (open)since two years ago .
1.答案:open.
2.
1)此处填入的open是个形容词,be open表可以延续的状态,后面可以加一段时间since two years ago(=for two years).
2) 如果填入opened,则不妥.因为be opened表示一个被动的动作,但是该动作是一个瞬间性动词,不能延续,也就不能加since two years ago了.