单项选择题

Today the public ______ about the way the environment is damaged.

A．is being concerned
B．is becoming concerned
C．has concerned
D．is concerning
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单项选择题
I regret to tell you that I have no choice to refuse your application.
A．than
B．and
C．but
D．or
单项选择题
We were asked to ______ our essay in three days.
A．hand out
B．hand over
C．hand in
D．hand down
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