单项选择题

People who love trees may ______.

A．never cause trees injury
B．damage trees on purple
C．do some harm to trees without knowing it
D．not be aware of which trees are healthy
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单项选择题
Which do you think is ______ important, health or wealth7
A．the more
B．more
C．most
D．the most
单项选择题
He was very sorry ______ her at the airport.
A．not to meet
B．to not meet
C．to have not meet
D．not to have met
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