单项选择题

I was giving a talk to a large group of people, the same talk I ______ to half a dozen other groups.

A．was giving
B．am giving
C．had given
D．have given
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单项选择题
In ______ review of 44 studies, American researchers found that men and women who ate six key foods daily cut the risk of ______ heart disease by 76%.
A．a; the
B．the; a
C．a; /
D．/; a
单项选择题
______ , most teenagers now listen to rock music. However, John prefers classical music.
A．In a word
B．In general
C．In particular
D．In total
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