--When and where ______ the accident ______?
--It happend in a factory yesterday.
A. was happening B. was happened
C. did happend D. did happen
科目：初中英語 來源： 題型：
--When and where ______ the accident ______?
--It happend in a factory yesterday.
A. was happening B. was happened
C. did happend D. did happen
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