2. 外语
  3. He found it very difficult___________(赶上)the development of physics.

He found it very difficult___________(赶上)the development of physics.

admin2013-03-11  46
问题 He found it very difficult___________(赶上)the development of physics.
选项
答案to keep pace with
解析 本题主要考查 keep pace with的用法，表示“赶上，追上”；另外，find it difficult后应加动词不定式形式。
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大学英语四级

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