问题

as in Inner Mongolia for two years, ____ as a volunteer teacher.
A:having worked
B:working
C:worked
D:to work;
B:working
C:worked
D:to work;
正确答案是:
同类题型
Most of the people _______to the party werefamous scientists.
I’d prefer to ____my judgment until I find all theevidence
______ I come to London alone? — Don’t worry, I ______ be meeting you at the airport.
Would you like to play chess with me?—Sorry, I have to finish my homework
__, he also had a son incollege who had taken a bank loan to pay for his studies.