—_____ you _____ the editor at the airport?
— No, he _____ away before my arrival.
| A．Have...met； has driven | B．Had...met； was driven |
| C．Did...meet； had been driven | D．Have...met； had driven |
It is the America’s selling weapons to Taiwan cast a shadow on the Sino—US relationship.
| A．what | B．which | C．that | D．where |
The ground has been cleared and houses for those homeless people now.
| A．build | B．have built | C．are built | D．are being built |
serious the economic situation is, they still have confidence in overcoming all the difficulties.
| A．Whatever | B．Although | C．Even though | D．However |
The teacher that his students had difficulty in English grammar, decided to give them more examples.
| A．knows | B．to know | C．knowing | D．being known |
Over the past decades, sea ice is decreasing in the Arctic global warming.
| A．as a result of | B．on top of | C．in front of | D．in need of |