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The question is easier ___ I thought.

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The pianist waited for silence ____ he began to play.

They promised to wait ____ the clock struck twelve.

He looked pale ____ he had seen a ghost.

地西泮溶于硫酸后,在紫外灯下呈现（）

A. 黄绿色荧光
B. 紫色色荧光
C. 蓝色荧光
D. 黄色荧光