He, a Nobelist, made great ______________ to researching in this area.A．encourag_刷题宝

题干

He, a Nobelist, made great ______________ to researching in this area.

A．encouragements

B．constitutions

C．breakthrough

D．contributions

上一题下一题 0.64难度单项选择更新时间:2012-09-16 09:08:32

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