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
It is requested that every student ______ a paper on sustainable development.
A) writes
B) wrote
C) writing
D) write
单项选择题
As Edison grew ______, he became more and more interested in science.
A) elder
B) the elder
C) older
D) the older
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