an open question造句

1、A UN official said he thought it was an open question whether sanctions would do any good.
一位联合国官员表示，他认为对于制裁是否能够起到作用这个问题，尚无定论。

2、An Open Question Concerning Whitney Maps on Hyperspaces
关于超空间上Whitney映射的一个问题

3、It's an open question at this point whether Guyana can stick to this strategy.
现在的问题是圭亚那是否会一直坚持这个策略。