--When and where ______ the accident ______?

--It happend in a factory yesterday.

A. was happening                        B. was happened 

C. did happend                          D. did happen

1、D

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--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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