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
The local authorities realized the need to make_______for elderly people in their housing programmes.
A．preparation
B．requirement
C．specification
D．provision
单项选择题
Where can I find Jim He is ______ his work. He won’’ t leave the lab until 6:00 p. m.
A．on
B．over
C．at
D．under
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