Negotiations would be drawn-out, such is the mistrust between the two sides, but that might be no bad thing, because they could turn into a useful forum.
不需要加and。因为 such is the mistrust between the two sides 与前句并不是并列关系,而是说话人做的补充说明,属于补充语,也可以理解为插入语分句。注意这个插入语分句用的是现在时,而其他三个分句都是过去时态。
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