单项选择题

The sale usually takes place outside the house, with the audience ______ on benches, chairs or boxes.

A．having seated
B．seating
C．seated
D．having been seated
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单项选择题
The computer can be programmed to_______a whole variety of tasks.
A．assign
B．tackle
C．realize
D．solve
单项选择题
Caroline ______ her speech when a stranger rushed in and interrupted her.
A．was to finish
B．finished
C．had finished
D．was to have finished
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