单项选择题

In addition, teaching staff is willing to extra help if a student needs.

A．providing
B．provide
C．provides
D．provided
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单项选择题
many times, but he still couldn't understand it.
A．Having told
B．Though he had been told
C．Having been told
D．He had been told
单项选择题
Busy he is. he can fulfill the task ahead of schedule.
A．because
B．no matter how
C．although
D．as
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