单项选择题

That is one of those books that（）worth reading.

A．is
B．are
C．has
D．have

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单项选择题
Thank you very much.Not at all. I was（）glad to help.

A．too
B．only too
C．not so
D．much
单项选择题
I know the day breaks now,（）the birds are singing.

A．for
B．where
C．if
D．when
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