Every possible means_____ been tried，and we find only______ this means can we do it well．
#86084
A
have，in
B
have，by
C
has，in
D
has，by
推荐题目
The number of people invited ____fifty, but a number of them _____absent for different reasons.
#43526
A
were; was
B
was ; was
C
was; were
D
were; were
Large quantities of polluted water_____ into the sea so that lots of fish died.
#86296
A
is flowing
B
was flowing
C
are flowing
D
were flowing
---What should I do If I had a million dollars? --- If I ______ you, I would give it to medical research.
#44093
A
am
B
was
C
were
D
will be
E-mail, as well as telephones, ______ an important part in daily communication.
#86209
A
isbeingplayed
B
areplaying
C
haveplayed
D
isplaying