题目内容
—Li Ping, your cousin speaks fluent English, like a native speaker.
—No wonder. He once _____ in New York for two years as a visiting professor.
| A．had worked | B．has worked | C．worked | D．has been working |
C
略
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—Li Ping, your cousin speaks fluent English, like a native speaker.
—No wonder. He once _____ in New York for two years as a visiting professor.