问题
选择题
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
答案
答案：C
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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
答案：C