When ---- the film ----?---It ---- for 15 minutes.(start)

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When----thefilm----?---It----for15minutes.(start)When----thefilm----?---It----for15minutes.(start)Wh

When ---- the film ----?---It ---- for 15 minutes.(start)
When ---- the film ----?---It ---- for 15 minutes.(start)

When ---- the film ----?---It ---- for 15 minutes.(start)
did , start
has been on
注;start是终止性动词,它的完成时不能与FOR短语连用,故要改为be on

did, start
has started
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