问题
选择题
A warning signal suddenly appeared on the screen of my computer, ______ the computer was being attacked by a certain virus.
A．indicated
B．indicating
C．to indicate
D．having indicated
答案
答案：B
题目分析：考查非谓语动词。signal和indicate是主谓关系，应该用现在分词表示伴随状况。句意：一个提示信号突然出现在我的电脑屏幕上，暗示电脑被病毒袭击了。故选B。