摘要： -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
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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.
A. had worked B. has worked C. worked D. has been working
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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.
| A．had worked | B．has worked | C．worked | D．has been working |