The Coast Guards reported ____________ a ship without hanging it

The Coast Guards reported ____________ a ship without hanging its national flag.
A、to see
B、to have seen
C、seeing
D、seen
【正确答案】：C
【题目解析】：report to do 报道去做某事；report doing sth 报道做某事（事情还没结束）；题意：海岸警卫队报告说看到一艘没有悬挂国旗的船。因此C符合题意。