The old man __________ in Tibet for two
题型:选择题
问题:
The old man __________ in Tibet for two years as a volunteer teacher;it is an experience he often mentions.
A.served
B.serves
C.is serving
D.has served
The old man __________ in Tibet for two years as a volunteer teacher;it is an experience he often mentions.
A.served
B.serves
C.is serving
D.has served