when _____the film ____(begin?it began half an hour ago,用所给词适当形式填空,还要说为什么那样选择.

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when_____thefilm____(begin?itbeganhalfanhourago,用所给词适当形式填空,还要说为什么那样选择.when_____thefilm____(begin?itb

when _____the film ____(begin?it began half an hour ago,用所给词适当形式填空,还要说为什么那样选择.
when _____the film ____(begin?it began half an hour ago
,用所给词适当形式填空,还要说为什么那样选择.

when _____the film ____(begin?it began half an hour ago,用所给词适当形式填空,还要说为什么那样选择.
did begin
因为根据回答可以看出句子是一般过去时,又因为begin是实意动词,所以变一般疑问句是借助于助动词did
我是英语专业的,