单项选择题

Mr. White______ for the teacher who was in hospital.

A．served
B．substituted
C．placed
D．replaced
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单项选择题
He underwent four______operations in two weeks.
A．consistent
B．relative
C．successive
D．respective
单项选择题
They have had a good harvest for three years in______.
A．line
B．end
C．row
D．succession
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