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
Grammar mistakes of this kind _____ widely among Chinese students.
#85807
A
have been made
B
has been made
C
have made
D
has made
Great quantities of soil _________ down the hillside by the rain last night.
#86030
A
was washed
B
were washed
C
wash
D
washes
A lot of people as well as the president of the animal protection association ____________ experiments on animals.
#85721
A
are opposed to do
B
oppose to doing
C
is opposed to doing
D
oppose doing