As you wander through the streets, you see thousands of masks but you have no idea the faces behind them look like.
Awhich
B. what
Cthat
D. how
网友回答
A. which
(答案→)B. what
C. that
D. how
解析：考查同位语从句。idea后跟同位语从句，从句中的look like缺少宾语，which指“哪个”，that无意义；how作状语。名词性从句中，作主语、宾语、表语，用what。故选B。