To their great , Tom’s problem proved not to be as serious as they had feared.
A. happy
B. worry
C. anxiety
D. relief
网友回答
A. happy
B. worry
C. anxiety
(答案→)D. relief
解析：
根据句意：汤姆的问题证明没有他们担心的那么严重，所以用：To their great relief“使他们宽慰的是”，A项是形容词，不符合，B、C也不符合句意。选D。