单项选择题

If we study day after day, there is nothing __ cannot be achieved.

A．.that
B．which
C．whom
D．we
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单项选择题
The students __ the exercises, the teacher went on to explain the text.
A．doing
B．did
C．having done
D． to do
单项选择题
China’s 11th __ plan __ great emphasis on the environment.
A．five-years, places
B．five-year, place
C．five-years, place
D．five-year, places
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