单项选择题

The shortage of energy is getting worse. It________ an immediate solution.

A．calls off
B．calls up
C．calls for
D．calls at
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单项选择题
This place, originally a small town, has been________ into a modern city.
A．transported
B．transferred
C．transmitted
D．transformed
单项选择题
(There are) twelve people (take part in) the experiment, four (working) (as a) group.
A．A
B．B
C．C
D．D
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