未知题型 As a public relations officer, he is said ________ some very influential people.A) to know B) to be knowing C)to have been knowing D)to have known

未知题型 The Car Club couldn't _________ to meet the?

未知题型 The millions of calculations involved, had they been done by hand,__________ all practical value by the time they were finished.A) had lost B)would have lost C)would lose D)should have lost