单项选择题

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

A．must be
B．must have been
C．had been
D．had to be
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单项选择题
It turned out that the children were not ______ for the accident.
A．to blame
B．to be blamed
C．to be blaming
D．to have been blamed
单项选择题
Tom has been a vegetarian ______ principle for years.
A．in
B．on
C．for
D．by
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