单项选择题

When he checked in a hotel, it was already nine o' clock in the evening.

A．inspected
B．registered
C．realized
D．departed'
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单项选择题
He expressed his gratitude to her for her favorable help with the experiment.
A．congratulations
B．sphere
C．thanks
D．sympathy
单项选择题
It is easy for scientists to understand the significance of the doctor's findings.
A．complexity
B．simplicity
C．clearness
D．importance
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