单项选择题

They thought the program was ______ investigating.

A．worth
B．worthy
C．worthwhile
D．worthing
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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
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
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