【題目】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】考查動(dòng)詞詞組。A. come up with跟上； B. catch up with趕上；C. push ahead with 推進(jìn)； D. put up with忍受。句意：盡管遇到重重阻礙和困難，他們毅然進(jìn)行克隆生物組織的研究。push ahead with毅然推進(jìn)。根據(jù)句意可知選C。

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