20. His sister left home in 1998, and______since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
“It’s too early to conclude that the problem but I think we have been moving in the right direction,” the manager said
| A．had been solved | B．had solved |
| C．has been solved | D．has solved |
----Dad, why is it import to have friends?
----Whenever you have difficulties, friends are always there lending you their hands.
-----
| A．No problem. | B．Got it. |
| C．All right. | D．Good idea. |
I In a society full of challenges and opportunities, in my opinion, it is a must to have a good ______ of a foreign language.
| A．communication. | B．comprehension. |
| C．command. | D．competence. |
—So you missed the meeting.
—________.I got there five minutes before it finished.
| A．Not at all | B．Not exactly |
| C．Not especially | D．Not really |
--Will you be__________ tonight, Mary?
--It depends. I’m afraid I’ll be called in by my manager.
| A．convenient | B．available |
| C．accurate | D．suitable |