Never before ____________ seen anybody who can play tennis as well as Robert.
A. had she B. she had
C. has she D. she has
You may ____________ it that Jennifer will come and help us if we are in trouble.
A. base on B. rely on
C. carry on D. hold on
The present situation is very complex, so I think it will take me some time to ____________ its reality.
A. make up B. figure out
C. look through D. put off
Experiments of this kind____ in both the U.S. and Europe well before the Second World War.
A. have conducted B. have been conducted
C. had conducted D. had been conducted
_________ himself with necessary knowledge and skills, Tom went to the job market with much confidence.
A. Equipped B. Equipping
C. Having equipped D. Being equipped
No matter how frequently__________, the works of Beethoven always attract large audiences.
A. performed B. performing
C. being performed D. to be performed
