When______to dough and heated, carbon dioxide is released, causing the dough to rise.

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问题 When______to dough and heated, carbon dioxide is released, causing the dough to rise.

选项 A、is added baking powder
B、added baking powder is
C、is baking powder added
D、baking powder is added

答案D

解析 句意:当把烘烤用粉加到面团里加热的时候,会释放出二氧化碳,使得面团涨开。when引导状语从句,语序应该为正常语序,因而A,C错误;B项语序混乱。这里明显应该用被动形式,而且有固定结构add to,所以应该选D。
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