单选题
It was their______decision to leave their country, and as a result, they lost their citizenship.(2003年中国社会科学院考博试题)
【正确答案】
B
【答案解析】解析：本题前半句是说，离开他们的国家是他们深思熟虑的决定。B项“deliberate深思熟虑的”符合题意，如：taking deliberate action(采取谨慎的行动)。其他三项“compulsory义务的；carefree无忧无虑的；modest谦虚的”都不正确。