the professor, _____ as a splendid speaker, was warmly received by the students.
A. To be known
B. knowing
C. known
D. having known
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Where are the____ seat?
A. reserving
B. reserved
C. to be reserving
D. having reserved
__their homework, they went out to play.
A. Finished
B. Finishing
C. Being finished
D. Having finished
__with his report, the boss told John to write it all over again.
A. Not being satisfied
B. Not to satisfy
C. Not having satisfied
D. Not satisfying
I've never seen the young man__next to the doctor.
A. sits
B. sitting
C. sat
D. to sit