单项选择题

Mr. Ralph has just received an invitation from that university to join ______ as a full professor.

A．association
B．committee
C．community
D．faculty
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单项选择题
The boy was injured when a firework ______ in his face.
A．went out
B．went off
C．went round
D．went up
单项选择题
Stunned by what had happened, the old man stood rooted ______.
A．on the spot
B．to the spot
C．on the ground
D．to the ground
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