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
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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
单项选择题
His homework ______, Bob decided to go and see the film.
A．done
B．was done
C．had been done
D．did
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