单项选择题

The experiment is at a ______ stage—we'll know the result in an hour.
A) critic C) major
B) critical D) life-and-death

A．The experiment is at a ______ stage—we'll know the result in an hour.
B．critic
C．critical
D．major
E．life-and-death

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单项选择题

Once environmental damage ______, it takes many years for the system to recover. A) is done C) has done B) will be done D) is to be done

A．Once environmental damage ______, it takes many years for the system to recover.
B．is done
C．will be done
D．has done
E．is to be done

单项选择题

The shop-lifter ______ without paying a dozen times. A) admitted to take goods C) admitted to be taking goods B) admitted to have taken goods D) admitted to having taken goods

A．The shop-lifter ______ without paying a dozen times.
B．admitted to take goods
C．admitted to have taken goods
D．admitted to be taking goods
E．admitted to having taken goods

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