no doubt the Amber Room is one of the wonders of the world.
A. It is; that
B. It is; whether
C. There is; that
D. There is; whether
网友回答
A. It is; that
B. It is; whether
(答案→)C. There is; that
D. There is; whether
解析：句意：毫无疑问，琥珀宫是世界奇观之一。There is no doubt about sth./that 从句意为“毫无疑问……”。是固定句式故选C。