He was unhappy when he sold his guitar.After all，he________it for a very long time.
(2013·辽宁，22)
| A．has had | B．had had |
| C．has | D．had |
Once a difficult and even dangerous place , Vietnam is now a friendly detestation that welcomes visitors from all over the world .
| A．considered; visiting | B．considered; to visit |
| C．considering; visiting | D．considering; to visit |
There are no easy answers to questions brought to us by the rapidly changing world, we can try to turn challenges into opportunities．
| A．so | B．but | C．for | D．then |
If they what I was saying, they'd know what I was talking about
| A．took the trouble to listen to | B．had trouble listening to |
| C．take the trouble to listen to | D．have trouble listening to |
"I wish you’d look at me when I'm trying to speak to you!" the teacher said.
| A．excitedly | B．pleasantly | C．hopefully | D．angrily |
Mr．Smith gave the attendants a wonder lecturethe company in the international conference.
| A．on behalf'of | B．owing to |
| C．in the place of | D．standing for |