单项选择题

As a matter of fact, the true nature of communication process can be concluded in one sentence: Who says ______ through what channel to whom.

A．what
B．when
C．how
D．where
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单项选择题
To such an extent ______ his empty speech that some of us began to doze.
A．did he go on with
B．he would go on with
C．he went on with
D．he did go on with
单项选择题
John had been working hard and ______.
A．so had his brother
B．so his brother had
C．so was his brother
D．so his brother did
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