单项选择题

______ is often the case, we have worked out the production plan.

A．Which
B．When
C．What
D．As
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单项选择题
A library with five thousand books ______ to the nation as a gift.
A．is offered
B．has offered
C．are offered
D．have offered
单项选择题
We wanted a new table for dinner, so my father bought ______ from a furniture store yesterday.
A．itself
B．one
C．himself
D．another
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