Professor Johnson is said some significant advance in his research in the past year.A. h

发布时间：2020-08-16 10:29:50


Professor Johnson is said      some significant advance in his research in the past year.
A. having made
B. making
C. to have made
D. to make

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A. having made
B. making
(答案→)C. to have made
D. to make
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