问题补充:
单选题He,aNobelist,madegreat______________toresearchinginthisarea.A.encouragementsB.constitutionsC.breakthroughD.contributions
答案:
D解析名词辨析。A鼓励;B 宪法;章程,法规;C突破;D贡献;make contributions to对…做出贡献;
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