The young couple was worried because neither of them was aware they had lost the necklace

问题补充：

The young couple was worried,because neither of them was aware they had lost the necklace.

A. of the place

B. of which

C. where

D. of where

答案：

A. of the place

B. of which

C. where

(答案→)D. of where

解析：aware的常见结构为：be aware of sth.或be aware （that）意为“知道，意识到，明白”。如果选A 项，在place后应加上where。由于宾语从句中需要地点状语，故选D。

答案：D