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One day before her mother's birthday ,she went shopping to f

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One day before her mother's birthday ,she went shopping to find her mother a nice present .When she had been ___1___ for an hour ,she came ___2___ a shop that was selling umbrellas cheap ,and decided that one of those would solve her ___3___.
1.A.thinking B.looking C.considering
2.A.across B.into C.about
3.A.puzzle B.diffculty C.problem
1.B 寻找
2.B 走进一家商店
3.C solve a problem 解决一个难题,习惯搭配.
再问: 1.是look for 这个词组吗?为什么for 不是搭配后面的时间?? 2.答案是come across,不知道为什么。。。
再答: 1. 这里不是 look for 搭配,for an hour 指持续了一个小时。.A.thinking C.considering 两选项意思不对,look 是不及物动词,如果用 look for,则要说成 look for a nice present。 2. come across “偶然遇到,碰巧遇到”,这个意思也有道理。有时,原文用某个词,是作者的意思,但编成完形填空时,命题者所给的选项中也会由于失误而放进去另外一个可以作为正确表达的选项,但最后只用命题者的答案评分。我自己命题时也犯过一些这样的失误。对这种情况,不必深究。