Question

【题目】_____ we all know, the Amber Room was missing.
A.As
B.It
C.Which
D.That

Answer 1

【答案】A
【解析】考查定语从句。句意：众所周知，琥珀屋已经消失，as 代指琥珀屋已经消失这件事，故选A项。