George preferred working to（）leisurely at home.
A. be sitting
B. sitting
C. to sit
D. have sat
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I regret（）that wonderful art exhibition last night.
A. not to see
B. to not see
C. not having seen
D. having not seen
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
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