单项选择题

The airport _______ next year will help promote tourism in this area.

A．being completed
B．to be completed
C．completed
D．having been completed
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单项选择题
Nowadays people are more concerned about the environment ______ they live.
A．what
B．which
C．when
D．where
单项选择题
_______ which university to attend, the girl asked her teacher for advice.
A．Not knowing
B．Knowing not
C．Not known
D．Known not
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