单项选择题

He had difficulty in _______ one from the other.

A．not telling
B．telling
C．being told
D．having told
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单项选择题
He has been asked to account _______ his absence.
A．for
B．on
C．of
D．about
单项选择题
_______ has recently been done to provide more flats for the propel, the housing problem in this city is still very serious
A．What
B．That
C．As a matter of fact
D．In spite of what
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