单选题 ______ they have boldly undertaken the construction of a 26 storied: building.
A. As they are young B. Young as they are
C. They are as young D. As young as they are

【正确答案】 B
【答案解析】as作为从属连词引导让步状语从句时，从句一般要求倒装，即将形容词或分词提到从句前，B符合这一要求，将其置入空当中，句子内容讲得通，因此B为正确选择。C和D置入空当中，句意都不通，因此均可排除。题意为：虽然他们很年轻，但却大胆地承担了一栋26层楼的建设任务。