单项选择题

Tine director gave me his _________ that he would double my pay if I did my job well.

A．warrant
B．obligation
C．assurance
D．certainty
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单项选择题
_________ the temperature falling so rapidly, we couldn't go on with the experiment.
A．Since
B．For
C．As
D．With
单项选择题
When he tried to make a _________ , he found that the hotel that he wanted was completely filled because of a convention.
A．complaint
B．claim
C．Reservation
D．decision
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