There are many kinds of birds in Austral
问题:
There are many kinds of birds in Australia,and over 140 species of snakes,many of
____are extremely dangerous.
A.them
B.which
C.what
D.those
There are many kinds of birds in Australia,and over 140 species of snakes,many of
____are extremely dangerous.
A.them
B.which
C.what
D.those