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
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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
单项选择题
On no account be removed from the library.
A．reference books may
B．may reference books
C．can't reference books
D．reference books can
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