问题
选择题
He, a Nobelist, made great ______________ to researching in this area.
A．encouragements
B．constitutions
C．breakthrough
D．contributions
答案
答案：D
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；
搜题请搜索小程序“爱下问搜题”