2. 外语
  3. College admissions and financial aid are games that are impossible to cheat at and difficult to understanding.

College admissions and financial aid are games that are impossible to cheat at and difficult to understanding.

admin2013-01-24  49
问题 College admissions and financial aid are games that are impossible to cheat at and difficult to understanding.
选项
答案understanding——understand
解析 词组be difficult to中，to不是介词．而是用来引导动词不定式。
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