she went online ,quickly ____that regular use of this kind of drug can lead to cancer.A.learning B.learned C.to learn D.having learned我感觉是learned 求真相..

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she went online ,quickly ____that regular use of this kind of drug can lead to cancer.A.learning B.learned C.to learn D.having learned我感觉是learned 求真相..

she went online ,quickly ____that regular use of this kind of drug can lead to cancer.A.learning B.learned C.to learn D.having learned我感觉是learned 求真相..
she went online ,quickly ____that regular use of this kind of drug can lead to cancer.
A.learning B.learned C.to learn D.having learned
我感觉是learned 求真相..

she went online ,quickly ____that regular use of this kind of drug can lead to cancer.A.learning B.learned C.to learn D.having learned我感觉是learned 求真相..
learning强调主动,且动作在went 同时发生
learned强调被动,且动作在went前已经完成
所以改选A

应该是A
因为learn的主语是she ,是主动态,用现在分词表示动作的同时

A
两句之间无连词,这里是分词做状语,因为本句中she 和learn是主动关系,所以用ing形式。 反之,若是被动关系则用过去分词形式。