单项选择题

So many directors ______, the board meeting had to be put off.

A．were absent
B．being absent
C．been absent
D．had been absent
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单项选择题
I’’m at my wits’’ end. Tell me _______ to do.
A．how
B．what
C．when
D．why
单项选择题
It was not until he closed the door ______ he ______ he forgot to take the keys with him.
A．that, realized
B．did, realize
C．which, realized
D．when, realized
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