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 _______ live in the countryside than in the city.
A．would rather
B．had better
C．may as well
D．prefers
单项选择题
He has been asked to account _______ his absence.
A．for
B．on
C．of
D．about
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