单项选择题

When the manager went to Canada on business, his () took over all his duties.

A．caretaker
B．officer
C．deputy
D．commander

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单项选择题
Mathematics () the study or science of numbers.

A．is
B．are
C．was
D．were
单项选择题
During the ten thousand miles journey across the desert, several men dropped with ().

A．fatigue
B．concession
C．grease
D．wreck
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