I would rather you __ talking.A.stop B.stopped C.to stop D.must stopwould rather一定要虚拟？

would rather不一定要虚拟。
would rather+动词原形 表示宁愿....
所以正确答案是：A

would rather + do
A.stop

用过去时
would rather sb did sth
would rather 其后要用虚拟语气的

B 虚拟语气 固定格式 要用过去时

答案是B
我给你讲讲would rather的用法
1.would rather + 动词原形 "宁愿做..."
I would rather die.我宁愿死
2.would rather do than do “宁愿做某事而不愿做...”
I would rather die than give in.我宁愿死也不愿屈服
3.would rather + 从句
因为和事实相反,所以用虚拟语气.与现在或将来事实相反,用一般过去时；与过去事实相反,用过去完成时
I would rather you had come yesterday.
I would rather we go tomorrow.
补充：would rather只有接从句的时候虚拟.
从句只有两种时态:过去时和过去完成时

2楼正确

是的
taling可知是现在的动作，与现在事实相反用从句用过去式。
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这个是不一定的，要根据句意。
本句是说：我宁愿你现在停止谈论，可是是说话人主观意愿，是与现在事实相反的，因此要用虚拟语气。
这里有虚拟语气的说明，你看一下吧http://baike.baidu.com/view/26751.html?wtp=tt