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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She had three sons, ______ were doctors.
A．whom
B．who
C．which
D．that
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It is important that each of you ______ a note-book to class with you every day.
A．will bring
B．must bring
C．brings
D．bring
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