.the damage would be incalculable．( )A．Should such a disaster occurB．If such a disaster had occurredC．Had such a disaster occurredD．If such a disaster should be occurred 题目和参考答案——青夏教育精英家教网—

7．________，the damage would be incalculable．（　　）

	A．	Should such a disaster occur
	B．	If such a disaster had occurred
	C．	Had such a disaster occurred
	D．	If such a disaster should be occurred

分析如果发生像这样的一场灾难的话，其损失将会是难以计算的．

解答答案：A．
分析句子的结构可知，这是一个表达对现在事实假设的句型，当if引导的虚拟条件句中含有should时，可构成虚拟语气中的倒装，即把if省略，将should提前，B、C项是对过去事实的假设，可排除，D项中的occur不能用于被动结构．故选A．

点评当虚拟条件句的谓语动词含有were，should，had时，可以将if省略，从句用倒装语序，即把were，should，had提前．解此题时需先认清此句是if省略的倒装情况，再根据从句的谓语动词形式确定动词的适当形式．

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