People have realized how important the environment is.but still trees in the world every year．( )A．were cut downB．cut downC．are cut downD．will be cut down 题目和参考答案——青夏教育精英家教网—

题目内容

20．People have realized how important the environment is，but still trees in the world every year．（　　）

	A．	were cut down		B．	cut down
	C．	are cut down		D．	will be cut down

分析人们已经认识到环境有多么重要，但是每年世界上仍然有许多树被砍伐．

解答答案：C
首先根据时间状语every year，判断用一般现在时，主语trees是动作cut down（砍伐）的承受者，所以用被动语态，一般现在时被动语态的构成是：主语+am/is/are+动词的过去分词，主语trees是复数名词，be动词用are，cut的过去分词是cut，故选C．

点评本题考查动词的时态和语态问题．要根据时间状语和语境进行判断．

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