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--Did you see the accident yesterday?

--Yes．It happened when I_______ past the museum．

A．walk           B．am walking            C．will walk           D．was walking

--- Did you see the traffic accident yesterday?

--- Yes. It happened when I ________ past the museum.

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(2005蘇州市)

--- Did you see the traffic accident yesterday?

--- Yes. It happened when I ________ past the museum.

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