---With the failure of the experiment.we have reached a dead end．---Cheer up!Many good things would never have happened if the bad events first．( )A．don't happenB．didn't happenC．hadn't happenedD� 题目和参考答案——青夏教育精英家教网—

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6．---With the failure of the experiment，we have reached a dead end．
---Cheer up!Many good things would never have happened if the bad events _____ first．（　　）

	A．	don't happen		B．	didn't happen
	C．	hadn't happened		D．	haven't happened

分析 -实验失败了，我们走进了死胡同．-振作点！如果坏事不先发生，许多好事就永远不会发生．

解答答案：C 句意表达的是对过去事实的相反假设，要用虚拟语气；对过去的虚拟，条件句中要用过去完成时态．故选C．

点评虚拟语气是表示与事实相反的假设，构成方式有：对现在或将来，条件句中用一般过去时态，主语用情态动词加动词原形；对过去，条件句中用过去完成时态，主语用情态动词加完成时态．学习时，要牢记构成方式．

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