单项选择题

A well coherent discourse ______ good choice of cohesive devices and semantic selection among other things.

A．calls for
B．calls on
C．calls up
D．calls forth
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单项选择题
The scholar's interest in the ______ and analytical aspect of music didn't prevent her from enjoying concerts.
A．intelligent
B．brilliant
C．knowing
D．intellectual
单项选择题
The millions of calculations involved, ______ by hand, would have lost all practical value by the time they were finished.
A．bad they been done
B．they had been done
C．having been done
D．they were done
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