It was not until the subprime loan crisis(次贷危机) ____ great damage to the American financial system that Americans ____ the severity of the situation.
| A．caused, realized | B．had caused, realized |
| C．caused, had realized | D．was causing, had realizedyjw |
He tried his best to solve the problem, ________ difficult it was．
| A．however | B．no matter |
| C．whatever | D．although |
Mo Yan was awarded the Nobel Prize for Literature in 2012, ________ made one of the Chinese people’s long-held dreams come true.
| A．it | B．that |
| C．what | D．which |
The fires burned for three days, ________ a total of 25,000 buildings.
| A．destroyed | B．to destroy |
| C．having destroyed | D．destroying |
Tom took a taxi to the airport, only ________ his plane high up in the sky.
| A．to find | B．finding |
| C．being found | D．to have found |
Li Na is a Chinese tennis player, who is said ________ the world championship last year.
| A．to win | B．to have won |
| C．won | D．to have been won |