A warning signal suddenly appeared on th
题型：选择题
问题：
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
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