easily
that 从句中不缺任何成分,这种情况下,即可.
这是填写副词的窍门,楼主记住：当某一句不缺任何成份时,只需填上所给单词的副词就是答案了.而且副词用在助动词（could） 和谓语动词（work out） 之间是最常见的位置了.
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We were surprised that he could _____ work out the hard problem.(easy)
We were surprised that he could _____ work out the hard problem.(easy)
英语人气：867 ℃时间：2019-11-09 18:36:41
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