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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单项选择题
You and I could hardly understand, __________
A．could we
B．couldn’t you
C．couldn’t we
D．could I
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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