单项选择题

John felt a little disappointed and was about to leave, ______ something occurred which attracted his attention.

A．while
B．when
C．until
D．unless
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单项选择题
Maria proposed that we ______ a party to celebrate the victory of our baseball team.
A．held
B．hold
C．would hold
D．will hold
单项选择题
In the bank he changed his pounds for the ______ amount of dollars.
A．identical
B．similar
C．equivalent
D．same
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