单项选择题

The student did his homework ______ his professor had assigned.

A．when
B．as
C．until
D．if
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单项选择题
At first ice cream was shaken by ______ hand in ______ pan of salt and ice.
A．a, the
B．the, a
C．/, a
D．the, the
单项选择题
Every minute must be made full use ______ at the preparations for the exams.
A．of to work
B．of work
C．of working
D．to working
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