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what句型The police are still trying to find out__________(是什么引

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what句型
The police are still trying to find out__________(是什么引起了这场火灾)
what句型The police are still trying to find out__________(是什么引
可以有多个答案,当然也要注意句子的时态对应.
1.最简单的:
what caused this/the fire
2.如果用复杂的强调句型做宾语从句,则为:
what it was that caused this/the fire
3.另注:this和the可以任用其一,而且caused可以换写成led to或resulted in.