I seem __________ her somewhere before but I can't make sure.A. to see B. to be seeingC: to have seen D. to be seen
The woman ________ Mr. Brown is a professor from Beijing University.
The head teacher comes to the classroom ______ to see if the students are quiet.
I’ve been playing the piano for four hours and I am ________ it.
Look, a demonstration ________ on Main Street.
What he has done has a bad effect ________ the children.