----I wonder what makes you a successful manager.----I ______ as a waiter for five years, which contributes a lot to my today’s work.
#100364
A
serve
B
have served
C
had served
D
served
推荐题目
 The wounded policeman ____though doctors made every effort to save him.
#103692
A
died
B
had died
C
killed
D
has been dead
 We will lose the game unless he ______ us. 
#103226
A
helps
B
helped
C
was helping
D
has helped