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

游客2023-07-15 33

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

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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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