单项选择题

He spoke slowly so that everyone ______ what he had said.

A．ought to understand
B．should understand
C．may understand
D．must understand
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单项选择题
I seem to have reached a rather gloomy conclusion, but I think that something cheerful may still be derived ______ it.
A．of
B．off
C．from
D．with
单项选择题
Dr. Johnson ______ the patient of the safety of the operations.
A．guaranteed
B．confirmed
C．assured
D．committed
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