问题补充:
is known to all,the Amber Room belongs to the Russians.
A. As
B. Which
C. It
D. What
答案:
(答案→)A. As
B. Which
C. It
D. What
解析:考查非限制性定语从句,as引导非限制性定语从句,指代整个主句的内容,在从句中做主宾表,这句话as代替的是the Amber Room belongs to the Russians.在从句中做主语,句意:正如大家都知道的,琥珀屋是属于俄罗斯的。选A。