单选题 The accident was ______ his careless use of gun.
A. because of B. owing to
C. due to D. on account of

【正确答案】 C
【答案解析】该题是词汇题,考查近义词组的辨析。四个选项均表示“因为”,但只有due to引导的短语能做表语用,也可以做定语、状语用;其他几个只做状语用。因此,根据题意,选项C为最佳答案。