题目内容
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 |
B
解析试题分析：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。
考点：考查非谓语动词
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