Dr. Zhong Nanshan is a pioneer has made a lot of contributions （贡献） in the field of medical science．（ ）
A．whichB．whoC．whoseD．what
- Is this dictionary _________?
-No, it isn't. I left my dictionary at home.
| A． |
your |
B． |
yours |
C． |
yourself |
Eric often _________his aunt before he moved to the city.
| A． |
has visited |
B． |
visits |
C． |
visited |
Frank and his friends had great fun _________volleyball on the beach yesterday.
| A． |
play |
B． |
playing |
C． |
to play |
Although it is raining _________, the policemen are still on duty in the street.
| A． |
clearly |
B． |
directly |
C． |
heavily |
Mr. Huang is an excellent English teacher who has over 20 years' teaching _________.
| A． |
experience |
B． |
information |
C． |
knowledge |