单选题 ______ a recent security alert, personal belongings should not be left unattended.
A. In spite of
B. With regard to
C. Due to
D. As of

【正确答案】 C

【答案解析】中级问题所有选项都是介词，所以只能靠分析词义来解题。句中说，“因为有”安全警报，所以大家必须小心个人物品，因此正确答案为A选项。相同意义的词组还有because of，owing to，on account of，请务必掌握它们的用法。
[高频词语] with regard to 关于 as of +日期从……开始 be left unattended 处于无人监管状态