_____ three influenza type A virus subtypes(子类型) have been found in pigs.
#27191
A
By far
B
As far as
C
So far
D
Till far
推荐题目
 The ship sailed _____ Xiamen _____ 30 miles an hour.
#27572
A
for, at
B
to, at
C
to, by
D
for, by
People built a monument_________those who died for the country.
#25301
A
in praise of
B
in need of
C
in hope of
D
in honor of
 If you keep on, you’ll succeed _______.
#28265
A
in time  
B
at one time
C
at the same time
D
on time