---Hurry, John!---Oh, damn! Both my legs are nearly to give out. I ____for hours.
#101892
A
had walked
B
walked
C
have been walking
D
am walking
推荐题目
The old city wall ______ in the Ming Dynasty.
#103432
A
was been built
B
has been built
C
was built
D
had been built
-Why does the Lake smell terrible?-Because large quantities of water__________. 
#104945
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
To his disappointment, the opinion he had stuck              out wrong.
#103365
A
to turn
B
to turning
C
to turned
D
to be turned
一Have you got any job offers?一No.I      I’ll not give up,whatever the result is
#103416
A
waited
B
have waited
C
had been waiting
D
have been waiting