问题

The old man __________ in Tibet for two years as avolunteer teacher;it is an experience he oftenmentions.
A:served
B:serves
C:is serving
D:has served
B:serves
C:is serving
D:has served
正确答案是:
同类题型
Her parents ______ from Shanghai.
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are you getting on with your work— Oh, I’m sorry Things aren’t going sowell as ____
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Parents’ behaviours can their children, so they should behave themselves.