Since to the world, the dance “Gangnam Style” has gained greart great popularity.
| A．introduced | B．introducing |
| C．being introduced | D．to be introduced |
_______,his idea was accepted by all the people at the meeting.
| A．Strange as might it sound |
| B．As it might sound strange |
| C．As strange it might sound |
| D．Strange as it might sound |
Many of them turned a deaf ear to his advice, _______ they knew it to be valuable.
| A．as if | B．now that | C．even though | D．so that |
he field research will take Joan and Paul about five months; it will be a long time _______ we meet them again.
| A．after | B．before | C．since | D．when |
He was told that it would be at least three more monthshe could recover and return to work.
| A．when | B．before | C．since | D．that |
It is difficult for us to learn a lesson in life ____we’ve actually had that lesson.
| A．until | B．after | C．since | D．when |