单项选择题

I regret ______ you that I can't go to Hangzhou for a visit next Sunday with you, because I've caught a bad cold.

A．to tell
B．telling
C．leaving
D．left
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单项选择题
It will be safer to walk the streets because people will not need to carry large amounts of cash; virtually all financial ______ will be conducted by computer.
A．transaction
B．transmissions
C．transitions
D．transformation
单项选择题
While nuclear weapons present grave ______ dangers, the predominant crisis of overpopulation is with us today.
A．inevitable
B．constant
C．overwhelming
D．potential
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