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句子中有by far(意思是“到目前为止”)作时间状语时,句子谓语动词用现在完成时,例如:
These children have learned more than three thousand new English words by far.到目前为止,这些孩子已经学完了三千多个英语新单词(本句中,by far作时间状语,句子谓语动词用了现在完成时have learned)
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