单项选择题

It is I who ______ to blame for the mistake.

A．is
B．am
C．be
D．were
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单项选择题
In the past several years, the representatives of the two countries have met frequently to discuss ______ issues.
A．a cluster of
B．a host of
C．a flock of
D．a bunch of
单项选择题
This young man's attraction to MP3s cannot be explained only ______ familiarity with technology.
A．with terms of
B．by terms of
C．on terms of
D．in terms of
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