问题
选择题
No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．
A．which
B．what
C．it
D．they
答案
答案：C
C it在句中指时间，属于实指。
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No one knows exactly when our ancestors started talking，but new evidence suggests _______might have happened a long time ago．
A．which
B．what
C．it
D．they
答案：C
C it在句中指时间，属于实指。