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
Further studies are needed before we ______ can with this problem.
A．provide
B．agree
C．attach
D．deal
单项选择题
Tom' s motor-cycle, ______ he goes to work every day, is often in the garage for repairs.
A．with which
B．on which
C．which
D．from which
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