单项选择题

The headmaster requested that all students ______ on time to school.

A．be
B．were
C．had to arrive
D．must have to be.
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单项选择题
Do you know who invented ______ first telephone, by ______ way
A．/; the
B．a; the
C．the; a
D．the; the
单项选择题
Hardly had she finished her lecture ______ the students started clapping.
A．and
B．when
C．than
D．as
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