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