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—You know, people are required to wear a...

—You know, people are required to wear a helmet while riding a motorbike.

—Oh, that's ___________ important rule to keep people safe.

A.a B.an C.the D./

 

B 【解析】 句意:——你知道,人们骑摩托车时必须戴头盔。——哦,这是保证人身安全的一个重要规则。 考查冠词。不定冠词a/an用于单数可数名词前表泛指,a用在以辅音音素开头的名词前,an用在以元音音素开头的名词前;定冠词the表特指;从文字的表层意思推断空格指“一个重要规则”——表泛指,所以,空格用不定冠词;important以元音音素开头,不定冠词用an;故选B。  
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