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
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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
单项选择题
She had three sons, ______ were doctors.
A．whom
B．who
C．which
D．that
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