单项选择题

If you find this item too difficult to _______, it is advisable to leave as it is and move on to the next one.

A．work out
B．work on
C．work for
D．work at
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单项选择题
She has managed to obtain a temporary work __________ in Britain.
A．permit
B．permission
C．permissiveness
D．permissible
单项选择题
There was an accident _______ the crossroads at midnight last night.
A．in
B．on
C．at
D．by
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