单项选择题

The basic features of the communication process are identified in one question: Who says （） through what channel to whom

A．how
B．when
C．what
D．such

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单项选择题
That young man still denies （） the fire behind the store.

A．start
B．to start
C．having started
D．to have started
单项选择题
So many directors （）, the board meeting had to be put off.

A．were absent
B．been absent
C．had been absent
D．being absent
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