单选题   To our ______, Geoffrey's illness proved not to be as serious as we had feared.
 
【正确答案】 B
【答案解析】本题考查固定短语。to one's relief为固定搭配，意为“令人宽慰的是”，强干扰项anxiety结构上符合，但语境上不符合not...serious...故答案为B。