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A warning signal suddenly appeared on the screen of my computer, ______ the computer was being attacked by a certain virus.
A.indicatedB.indicating
C.to indicateD.having indicated
B

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。
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