_____ 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
Life is more than merely trying to achieve thestandards of society but trying to be a good person ______ one’s own standards.
#25841
A
at
B
in
C
on
D
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