单项选择题

It is said that John Major didn't himself go to Oxford, ______ most of his ministers did.

A．after
B．since
C．while
D．if
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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
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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