As you wander through the streets, you see thousands of masks but you have no idea_____ the faces behind them look like.
A． whichB．whatC． thatD．how
B

試題分析：考查同位語從句。idea后跟同位語從句，從句中的look like缺少賓語，which指“哪個”，that無意義；how作狀語。名詞性從句中，作主語、賓語、表語，用what。故選B。
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