No one knows exactly when our ancestors
题型:选择题
问题:
No one knows exactly when our ancestors started talking, but new evidence suggests that____ might have happened a long time ago.
A.which
B.what
C.it
D.they
No one knows exactly when our ancestors started talking, but new evidence suggests that____ might have happened a long time ago.
A.which
B.what
C.it
D.they