How long will the film last_____(at/for)?

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Howlongwillthefilmlast_____(at/for)?Howlongwillthefilmlast_____(at/for)?Howlongwillthefilmlast_____(

How long will the film last_____(at/for)?
How long will the film last_____(at/for)?

How long will the film last_____(at/for)?
for或不填

for

for
last for持续

for

for
因为既然前面是how long,所以肯定是一段时间,for后面可以加一段时间,而at只是 加一个时间点,比如at three 在三点,而3个小时则可以说for three hours

How long will the film last__for___(at/for)?

for
只有for 是加时段
还原得:The film will last for 2 hours。
at一般加地点,或者时间点 ru:at 7 o‘clock