Question

Mr. Green is said________ an experiment to prove their new method of solving the problem whenyoung.

1. A.
   to do
2. B.
   to havedone
3. C.
   to bedoing
4. D.
   to havebeen doing

Answer 1

B
不定式作主补带有宾语及宾语补足语结构的动词变为被动语态时，原来的宾语变为主语，宾补则变为主补。