As can be gathered from the passage, before 1910 the normal running time of a film was probably ____

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As can be gathered from the passage, before 1910 the normal running time of a film was probably ______.

A.15 minutes or less

B.between 15 and 30 minutes

C.between 30 and 45 minutes

D.1 hour or more

参考答案:

A