单项选择题

Some people think that animal research is irrelevant ______ our health and that it can often produce misleading results.

A．with
B．at
C．on
D．to
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单项选择题
He never said that he was good at mathematics, ______
A．was he
B．wasn't he
C．did he
D．didn't he
单项选择题
—Why did you leave that position—I ______ a better position at IBM.
A．offer
B．offered
C．am offered
D．was offered
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