Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.

　　A. to do            B. to have done       C. to be doing        D. to have been doing

Mr. Green is said _____ an experiment to prove the new method of solving　the problem when young.

　　A. to do            B. to have done

　　C. to be doing      D. to have been doing

Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.

　　A. to do            B. to have done       C. to be doing        D. to have been doing

Mr. Green is said _____ an experiment to prove the new method of solving　the problem when young.

A. to do             B. to have done       C. to be doing        D. to have been doing

Mr Green is second ______ speed _______ none as a famous athlete.

       A. at; to                       B. at; with                           C. in; to                       D. in; with