单项选择题

They required that all the necessary documents ______ to the president's office before the end of this month.

A．be handed
B．must be handed
C．should hand in
D．had been handed in
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单项选择题
______ neglecting our education, my father sent my brother and me to a summer school.
A．To be accused of
B．Accusing of
C．That he was accused of
D．Accused of
单项选择题
The reason for his failure is ______ he didn't work hard.
A．that
B．as
C．since
D．because
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