单项选择题

Never before（）made so great achievements in developing new technology of communication.

A．we have
B．did we
C．have we
D．do we

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单项选择题

Supposing this ship（）, do you think there would be enough life jackets for ail the passengers

A．was sinking
B．has sunk
C．were to sink
D．sunk

单项选择题

Children should read such books（）will make them better and wiser in their life.

A．which
B．what
C．as
D．that

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