单项选择题

It is obvious that it has been too late to take action.

A. true
B. certain
C. said
D. apparent
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单项选择题
A great deal has been done to remedy the situation.
A．maintain
B．improve
C．assess
D．protect
单项选择题
He is but a child.()

A. probably
B. not
C. hardly
D. only
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