They are just trying to reach a point both sides will sit down together at the table.
A. where
B. that
C. when
D. which
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(答案→)A. where
B. that
C. when
D. which
解析：考查定语从句。句意：我们都在试图达到能使双方坐下来交谈的这一地步。先行词是 a point。定语从句中缺少地点状语，Both sides will sit down together and talk at a point.这里的where就是指代这个at a point。选A。