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

游客2023-07-15  23

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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