the policeman entered the building,------upsairsA looking about and hurrying B looked about and hurrying为什么选A

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the policeman entered the building,------upsairsA looking about and hurrying B looked about and hurrying为什么选A
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the policeman entered the building,------upsairsA looking about and hurrying B looked about and hurrying为什么选A
the policeman entered the building,------upsairs
A looking about and hurrying B looked about and hurrying为什么选A

the policeman entered the building,------upsairsA looking about and hurrying B looked about and hurrying为什么选A
A
这是现在分词短语作状语表伴随行为的
分词作状语时,逻辑主语和句子的主语是一致的,可见是表主动,进行的,故用现在分词‘

选A
用进行式做伴随状语
学习是一件愉快的事! (*^__^*)
请及时采纳,多谢!

现在分词表主动,作目的状语

ing短语作伴随状态

是这样, ing表示伴随状语 ,你可以这样翻译,这个警察一边进入这个建筑物,一边看上面

独立主格问题,v-ing表示人主动发出的动作,而v-ed表示被动的,句子中警察主动发出看这个动作,用主动形式

looking about和hurrying upstairs两个动作并列,是enter the building这个动作的伴随状语,用非谓语形式。
B选项如果改为looked about and hurried也可以,那就看作and连接entered,looked,hurried三个先后发生的动作,都用过去时。