题目内容

渣洗过程中,熔渣被钢流冲击而死化,为了提高渣洗的效果,希望死化渣滴的半径尽可能小,以提高渣钢接触界面积()

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Professor Johnson is said _____ some significant advance in his research in the past years.

A. having made
B. making
C. to have made
D. to make

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