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
Spring（）, we may perhaps look forward to better weather and more outdoor activities（）

A．coming
B．having come
C．to be coming
D．is coming
单项选择题
Most environmental problems exist because adequate measures for preventing them （）taken in the past

A．was not
B．were not
C．were not being
D．had not been
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