What was that ------just passed by us?横线中填关系代词或关系副词,用which还是that,
问题描述：
What was that ------just passed by us?横线中填关系代词或关系副词,用which还是that,
答
用which
不能用that,因为前面已经有that做先行词的,不重复.
又如：
Who that knows him wants to be his friend?这里就不能用who了.