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【题目】Despite barriers and hardships,they ______ the research on cloning tissues.

A. come up with B. catch up with

C. push ahead with D. put up with

【答案】C

【解析】考查动词词组A. come up with跟上; B. catch up with赶上;C. push ahead with 推进; D. put up with忍受句意:尽管遇到重重阻碍和困难,他们毅然进行克隆生物组织的研究。push ahead with毅然推进。根据句意可知选C。

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