单项选择题

Professor Smith and Professor Brown will ______ in presenting the series of lectures on American literature.

A．alter
B．alternate
C．substitute
D．exchange
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单项选择题
The children like to ______ the new English teacher, who has a noticeable manner of walking.
A．take out
B．take over
C．take down
D．take off
单项选择题
Better late than never is a ______ that is very familiar to most English speakers.
A．plaudit
B．plenary
C．plenty
D．platitude
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