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

試題分析：考查非謂語(yǔ)動(dòng)詞。signal和indicate是主謂關(guān)系，應(yīng)該用現(xiàn)在分詞表示伴隨狀況。句意：一個(gè)提示信號(hào)突然出現(xiàn)在我的電腦屏幕上，暗示電腦被病毒襲擊了。故選B。
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