题目内容

I regret（）that wonderful art exhibition last night.

A. not to see
B. to not see
C. not having seen
D. having not seen

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You can borrow my computer（）you promise to use it carefully.

A. as long as
B. while
C. since
D. so that

It was only then（）how much trouble I had caused to him.

A. had I realized
B. that I realized
C. I did realize
D. did I realize

下列关于我国西部地区的地理差异，正确的是( )。

A. 甘新多沙漠戈壁，青藏多大河湖泊
B. 陕甘宁地势低平，云贵川地形崎岖
C. 新疆的河流皆为内流河，西藏的河流皆为外流河
D. 青海高寒干旱，甘肃温暖湿润

在直方图中，质量能力处于临界状态时，表现为质量数据的分布（）。

A. 充满上限
B. 充满下限
C. 充满上、下限
D. 无规律运动