单项选择题

The classroom needs______.

A．clean
B．to clean
C．to be cleaned
D．being cleaned
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单项选择题
the population is too large, we have to take measures to control the birth rate.
A．Although
B．Since
C．If
D．Until
单项选择题
Wordsworth was one of the greatest poets ______ lived in the 19th century.
A．which
B．who
C．those
D．that
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