单项选择题

My pain ______ apparent the minute I walked into the room, for the first man I met asked sympathetically , "Are you feeling all right"

A．must be
B．had been
C．must have been
D．had to be
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单项选择题
The person who ______ this type of research deserves our praise.
A．originated
B．manufactured
C．generated
D．estimated
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With all its advantages, the computer is by no means without its ______.
A．boundaries
B．restraints
C．confinements
D．limitations
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