单项选择题

______ , the program went through without any problem during the performance.

A. To our relief
B. To our regret
C. In return
D. In detail
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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
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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