单项选择题

Not only the whole nation, but the whole Europe, indeed the whole human society（）to alter its attitude to racial problems.

A．need
B．needs
C．has a need
D．have a need Section B

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单项选择题

We（）on it for many hours but we have not yet reached any concinsion.

A．work
B．have been worked
C．have been working
D．are working

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