单项选择题

In the Middle Ages students ______ .

A．took objective tests
B．specialized in one subject
C．were timed by electric clocks
D．never wrote exams
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单项选择题
It may be concluded that testing ______ .
A．should test only opinions
B．should always be written
C．has changed since the Middle Ages
D．is given only in factories
单项选择题
Modern industry must have developed ______ .
A．before the Middle Ages
B．around the 19th century
C．in Greece or Rome
D．machines to take tests
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