单项选择题

I regret __________ hard at school, or I would have passed the exam.

A．to have not worked
B．having not worked
C．not to have worked
D．not having worked
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单项选择题
No sooner had we reached the top of the hill __________ we all sat down to rest.
A．when
B．then
C．than
D．until
单项选择题
There __________ in his room.
A．are too many furnitures
B．is too much furniture
C．are too much furniture
D．is too many furnitures
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