are often后面加ed还是doing为什么?最好举例子还有i wasn't 后面是+ed还是doing
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![are often后面加ed还是doing为什么?最好举例子还有i wasn't 后面是+ed还是doing](/uploads/image/z/7418908-28-8.jpg?t=are+often%E5%90%8E%E9%9D%A2%E5%8A%A0ed%E8%BF%98%E6%98%AFdoing%E4%B8%BA%E4%BB%80%E4%B9%88%3F%E6%9C%80%E5%A5%BD%E4%B8%BE%E4%BE%8B%E5%AD%90%E8%BF%98%E6%9C%89i+wasn%27t+%E5%90%8E%E9%9D%A2%E6%98%AF%2Bed%E8%BF%98%E6%98%AFdoing)
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