_____ scores of times , but he still couldn’t understand it ．
A．Having explained B．Having been explained
C．Though it was explained D．It was explained
________ their son away to college, the old couple got more room in the house．
A．As B．For C．Through D．With
_______ that Marie was able to set up new branches elsewhere．
A．So successful her business was B．So successful was her business
C．Such successful business she had D．So successful business had she
— Have you ever visited the Opera House?
—Yes．When I was in Sydney, I ______ it twice．
A．have visited B．visited C．had visited D．would visit
The man had expected to see all his relatives when in hospital, but _________ came to see him while many of his friends offered him their help.
A. none B. no one C. someone D. anyone
_________that developed countries want to limit the development of the developing countries in the climate conference in Copenhagen.
A. It is no possibility B. It is no need
C. There is no denying D. There is no chance
