One summer night in 1990, a reporter appeared at the door of Thomas Edison’s laboratory, _____ for an interview.
| A．asked | B．having asked |
| C．being asked | D．Asking |
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One summer night in 1990, a reporter appeared at the door of Thomas Edison’s laboratory, _____ for an interview.
| A．asked | B．having asked |
| C．being asked | D．Asking |
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