-Why does the lake smell terrible?-Because large quantities of water ．( )A．is being pollutedB．have been pollutedC．is pollutedD．has been polluted 题目和参考答案——青夏教育精英家教网—

8．-Why does the lake smell terrible？
-Because large quantities of water ．（　　）

	A．	is being polluted		B．	have been polluted
	C．	is polluted		D．	has been polluted

分析 --为什么湖水这么难闻？
--因为大量的水已经被污染了．

解答答案：B．根据the lake smell terrible（湖水这么难闻）可以知道水已经被污染了，所以用现在完成时态的被动语态，选择B．如果主语用 a large quantity of water，那么选择D．

点评考查现在完成时态的被动语态．被动语态的结构主要有以下几种：一般是be done；进行式 be being done；完成式 have been done；将来式will be done．

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