A warning signal suddenly appeared on the screen. the computer was being attacked by a certain virus．( )A．indicatedB．indicatingC．to indicateD．having indicated 题目和参考答案——青夏教育精英家教网——

题目内容

13．A warning signal suddenly appeared on the screen，______ the computer was being attacked by a certain virus．（　　）

	A．	indicated		B．	indicating
	C．	to indicate		D．	having indicated

分析一个警示信号突然出现在电脑屏幕上，表明这台电脑正在受到某个病毒的攻击．

解答答案是B．本题考查现在分词做状语；题干中indicate引导从句做前句的伴随状语，而且indicate 和warning signal 之间是主动关系，所以选择B indicating．A表示被动；C表示目的；D表示发生在谓语动词之前，都与句子结构不符．

点评首先判断选项中的动词在句中是以谓语还是非谓语形式出现；然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断．要积累常见非谓语动词的搭配和句型．

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