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 本题考查句子结构。分析句子结构可知,when为状语从句引导词,句子语序应为正常语序,故排除[A]项和[C]项;[B]项语序混乱,add to为固定短语,且需用被动形式。因此,答案为[D]项。
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