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问题: They have no idea at all______questioned by the police.

A.why he was
B.the reason why he was
为什么B不可以?

解答:

They have no idea at all 其后可以跟一个同位语从句表示原因,或者跟一个介词短语表示原因,因此,当其后跟同位语从句时,答案则是A,如果跟介词短语时,则为they have no idea at all of the reason he was questioned by the police.