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.
#85825
A
were; was
B
was; was
C
was; were
D
were; were