单项选择题

I have enjoyed my visit here. I'll be very sorry ().

A．for leaving
B．to leave
C．of leaving
D．with leaving

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单项选择题
The traffic was very heavy, () I would have been here half an hour sooner.

A．however
B．otherwise
C．anyway
D．although
单项选择题
Trial and error () the source of our knowledge.

A．is
B．are
C．has been
D．have been
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