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
Now that the plan has been worked out it must be put into ______ at once.
A．reality
B．practice
C．deed
D．in turn
单项选择题
His desk-mate talked happily about the teachers and lessons ______ she prefers to choose for the coming term.
A．which
B．who
C．when
D．that
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