—Why do you look worried?—Fred left the company half an hour ago. His work ________ unfinished since.
#104729
A
left
B
was left
C
has left
D
has been left
推荐题目
Jimmy didn’t notice his head teacher entering his bed room. He _____a phone call.
#104055
A
answered
B
has answered
C
was answering
D
is answering
By the time you arrive in London, we ______ in Europe for two weeks. 
#104980
A
shall stay
B
have stayed
C
will have stayed
D
have been staying