My friend, who      on the International Olympic Committee all his life, is retiring next month.
#101632
A
served
B
is serving
C
had served
D
has served
推荐题目
Ladies and gentlemen, please fasten your seat belt. The plane __________. 
#102320
A
takes off
B
is taking off
C
has taken off
D
took off
No decision __about any future appointment until all the candidates have been interviewed.
#101555
A
will be made
B
is made
C
is being made
D
had been made
 When I ________ home, I caught a thief stealing from a passer­by.
#99477
A
headed
B
was heading
C
has headed
D
had headed