单项选择题

I told you ______ I knew. When did I conceal the matter from you

A．on the instant
B．at the instant
C．for instance
D．the instant
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单项选择题
The letter was addressed in ______, so it couldn't be delivered to the rcal receiver.
A．error
B．mistake
C．fault
D．shortcoming
单项选择题
Many people protested before the Embassy and ______ for immediate stop to the war.
A．requested
B．appealed
C．called
D．begged
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