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
I know nothing about his journey（）he was likely to be away for three weeks.

A．if
B．unless
C．until
D．except that
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