单项选择题

He was ______ of having asked such a silly question.

A．tired
B．fond
C．ashamed
D．miserable
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单项选择题
The sun warms the earth, ______ makes it possible for plants to grow.
A．this
B．that
C．as
D．which
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．transactions
B．transmissions
C．transitions
D．transformation
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