单项选择题

The booksellers didn't want to buy all the books, ______.

A．did he
B．didn't they
C．do they
D．did they
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单项选择题
The doctor ______ him to give up smoking, but he refused.
A．insisted
B．suggested
C．persuaded
D．advised
单项选择题
Further studies are needed before we ______ can with this problem.
A．provide
B．agree
C．attach
D．deal
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