—Does Li Ping serve in the army?—No, but he ________ in the army for five years. 
#104477
A
served
B
has served
C
is serving
D
would serve
推荐题目
-----What’s that terrible noise? -----The neighbours ________ for a party.
#102452
A
have prepared.
B
are preparing.
C
was preparing.
D
will prepare.
Great changes in every field _____ in the last ten years. 
#99202
A
take place
B
took place
C
have taken placed
D
had taken place