问题补充：
When the woman found her borrowed valuable necklace (项链) , she felt the world was at an end.
A. was missing; unless
B. was lost; as if
C. was missed; whether
D. was gone; as if
答案：
A. was missing; unless
(答案→)B. was lost; as if
C. was missed; whether
D. was gone; as if
解析：形容词辨析。gone表示“丢了，没了”，含有一去不复返的意味，在句中可作表语和补语，但不能做定语。如： My fever is gone, but I still have a cough.我的烧已经退了，但还有些咳嗽。
She looked down at her dress and found her necklace gone. 她低头看了一下自己的衣服，发现项链不见了。
lost 表示“丢失”，含有失去后难以回归的意味，在句中可作定语，表语和补语。如： The parents found the lost child at last.父母亲终于找到了自己丢失的孩子。 His elder brother was lost at sea.他的哥哥在海里失踪了。 missing表示“失踪了，不见了”，强调某人或某物不在原处，在句中可作定语，表语和补语。如： My Japanese-Chinese dictionary is missing.我的日汉词典不见了。 The police are trying their best to find the missing school-girl.警方正在尽力寻找这个失踪的女生。As if似乎好像。句意：当那个女的发现自己借来的项链不见了的时候，她感觉这个世界好像都结束了。
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