单项选择题

Camping is fun ______ as you don't forget the torch and the can-opener.

A．unless
B．as long
C．as soon
D．if
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单项选择题
They got some valuable ______ from the night watchman.
A．informations
B．piece of information
C．information
D．pieces of informations
单项选择题
Neither the President nor the Vice President ______ signed the document.
A．has
B．have
C．is
D．are
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