It's unknown to us______the air crash occurred in the mountainous area yesterday.
A. that B. how
答案选择A。
请问为什么不是B,我们不知道昨天在山区的空难是如何发生的?然后由how引导的从句做真正主语。
It's unknown to us how the air crash occurred in the mountainous area yesterday.
=How the air crash occurred in the mountainous area yesterday(主语)// is(系动词)// unknown to us(表语)
以上结构为:It is adj+ that 从句,how引导的主语从句,it为形式主语。
How the prisoner escaped is a mystery. =It is a mystery how the prisoner escaped 犯人是如何逃跑的是个迷。
How we should do the job is still a question.=It is still a question how we should do the job.我们应该如何做这个工作仍然是一个问题。
How he solved the problem is still unclear=It is still unclear how he solved the problem.
他是如何解决这个问题仍然不清楚。
备注:unknown为形容词:意思是 不知道的;不了解的;未知的
An unknown number of demonstrators were arrested.有数目不详的示威者遭到了逮捕。
The man's identity remains unknown.这名男子的身份还是个谜。
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