单项选择题

It was a long time ______ the neighbors found that the old lady had been dead of cold.

[A] when
[B] until
[C] since
[D] before

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单项选择题

My little brother has never been to Beijing, but it's the place ______ .

[A] Where he'd like to visit
[B] he most wants to visit
[C] in which he'd like to visit
[D] that he wants to visit it most

单项选择题

With all its advantages, the artificial intelligence is by no means without its

[A] boundaries
[B] restraints
[C] confinements
[D] limitations

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