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

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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
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
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